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1dave
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Clay - Tumbling Speed Additive Nov 25, 2016 8:22:28 GMT -5 spiceman, Garage Rocker, and 1 more like this

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Post by 1dave on Nov 25, 2016 8:22:28 GMT -5

jamesp is having success using red clay as a slurry. It got me wondering so I posted:

Nov 23, 2016 9:06:19 GMT -5 1dave said:

A quick dive in mud over my head.

our normally visible planet Earth surface domain consists predominately of only eight elements:
1 - oxygen, 2 - silicon, 3 - aluminum,4 - iron;

O, s, a, i. That is easy to remember.

Then 5 - calcium, 6 - sodium, 7 - potassium, 8 - magnesium;

C, s, p, m.

Those are the eight major rock forming elements.

That is what most rocks we see are made of.

Remember Sail Boat. ‘Oh! Suddenly An Idea Came Sailing Past Me!’ sail

O s a i; c s p m. That is what makes up ninety nine percent of mud.”

That last one percent consists mostly of just eight more elements. In decreasing order, they are titanium, hydrogen, phosphorus, manganese, fluorine, barium, carbon, and strontium; T, h, p, m, f, b, c, s. The eight minor rock forming elements.
‘The Heavier Parts Made From Bigger Constructed Stars.’
That gets you to 99.9 percent of all mud.

All we have to do is toss out all that is not in your RED CLAY. Clay comes from the breakdown of feldspar so we can toss out a lot of quartz - SiO2, what more?

We have to keep the iron for the red, most likely aluminum because it is everywhere. Calcium,sodium, potassium, magnesium. Some of them have to be there. What do those electron shells do?

Last Edit: Nov 28, 2016 8:58:04 GMT -5 by 1dave

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Clay - Tumbling Speed Additive Nov 25, 2016 8:26:17 GMT -5

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Post by 1dave on Nov 25, 2016 8:26:17 GMT -5

What IS CLAY?

ClayGroups

Clay mineral, any of a group of important hydrous aluminum silicates with a layer (sheetlike) structure and very small particle size. They may contain significant amounts of iron, alkali metals, or alkaline earths.

CLAY ANALYSIS

PMET’s extensive experience in minerals analysis includes differential x-ray diffraction analysis of clay minerals. This technique uses oriented, heated, and glycolated clay preparations to qualify swelling and stable clay minerals. This analysis is important for chemical processes using absorptive clays, and in precious metal recovery to avoid losses. Analysis of subsoil swelling clay and pyrite is critical for construction of stable building foundations.

Soil Texture

Soil texture is the relative proportion of the various soil particle size fractions in soil. A soil texture class is defined as a range of particle size distributions with similar behavior and management needs.

Soil texture is commonly determined in the field by assessing the behaviour of a small handful of soil when moistened and kneaded into a ball. This is known as a bolus. The bolus is then pressed out between the thumb and forefinger. The bolus is assessed in terms of coherence, feel and length of ribbon that can be produced from it in this process. The rationale for doing this is that differing proportions of the various particle sizes (i.e. clay, silt and sand) of the fine-earth fraction confer a different “feel” to the soil.

Based on feel of the soil and the assessment of the bolus using various qualitative descriptors, a soil sample can be classified into a texture class. For example, a soil sample which can be formed into a long ribbon of approximately 50-75 mm and has the following qualitative properties; is coherent, has a plastic feel and fine to medium sand can be felt and heard, would be considered to belong to the Sandy Clay soil texture class.

It seems to me you could separate the clay components by mineral weight by placing a sample in a home made centrifuge. Calcium could be detected with vinegar.

Magnesium is naturally found in some types of clay soils.
Clay soils with extremely high magnesium is the type of clay that can be used for pottery because the magnesium binds the clay together.

One old timer story says you can tell how much magnesium there is in your soil by the thickness of the soil
that sticks to your boots!

A couple of Resources:
THERMOGRAVIMETRIC ANALYSIS OF CLAY AND CLAY-LIKE MINERALS

CLAY MINERALS IN MIXTURES

Last Edit: Nov 25, 2016 13:58:32 GMT -5 by 1dave

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Clay - Tumbling Speed Additive Nov 25, 2016 8:26:34 GMT -5 spiceman and MrMike like this

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Post by 1dave on Nov 25, 2016 8:26:34 GMT -5

The Clay Minerals are a part of a general but important group within the phyllosilicates that contain large percentages of water trapped between their silicate sheets. Most clays are chemically and structurally analogous to other phyllosilicates but contain varying amounts of water and allow more substitution of their cations. There are many important uses and considerations of clay minerals. They are used in manufacturing, drilling, construction and paper production. They have great importance to crop production as clays are a significant component of soils.

It is the physical characteristics of clays (more so than chemical and structural characteristics) that define this group:

Clay minerals tend to form microscopic to sub microscopic crystals.
They can absorb water or lose water from simple humidity changes.
When mixed with limited amounts of water, clays become plastic and are able to be molded and formed in ways that most people are familiar with as children's clay.
When water is absorbed, clays will often expand as the water fills the spaces between the stacked silicate layers.
Due to the absorption of water, the specific gravity of clays is highly variable and is lowered with increased water content.
The hardness of clays is difficult to determine due to the microscopic nature of the crystals, but actual hardness is usually between 2 - 3 and many clays give a hardness of 1 in field tests.
Clays tend to form from weathering and secondary sedimentary processes with only a few examples of clays forming in primary igneous or metamorphic environments.
Clays are rarely found separately and are usually mixed not only with other clays but with microscopic crystals of carbonates, feldspars, micas and quartz.

Clay minerals are divided into four major groups. These are the important clay mineral groups:

The Kaolinite Group
This group has three members (kaolinite, dickite and nacrite) and a formula of Al2Si2O5(OH)4. The different minerals are polymorphs, meaning that they have the same chemistry but different structures (polymorph = many forms). The general structure of the kaolinite group is composed of silicate sheets (Si2O5) bonded to aluminum oxide/hydroxide layers (Al2(OH)4) called gibbsite layers. The silicate and gibbsite layers are tightly bonded together with only weak bonding existing between the s-g paired layers.

Uses: In ceramics, as a filler for paint, rubber and plastics and the largest use is in the paper industry that uses kaolinite to produce a glossy paper such as is used in most magazines.

The Montmorillonite/Smectite Group
This group is composed of several minerals including pyrophyllite, talc, vermiculite, sauconite, saponite, nontronite and montmorillonite They differ mostly in chemical content. The general formula is (Ca, Na, H)(Al, Mg, Fe, Zn)2(Si, Al)4O10(OH)2 - xH2O, where x represents the variable amount of water that members of this group could contain. Talc's formula, for example, is Mg3Si4O10(OH)2. The gibbsite layers of the kaolinite group can be replaced in this group by a similar layer that is analogous to the oxide brucite, (Mg2(OH)4). The structure of this group is composed of silicate layers sandwiching a gibbsite (or brucite) layer in between, in an s-g-s stacking sequence. The variable amounts of water molecules would lie between the s-g-s sandwiches.

Uses: Are many and include a facial powder (talc), filler for paints and rubbers, an electrical, heat and acid resistant porcelain, in drilling muds and as a plasticizer in molding sands and other materials.

The Illite (or The Clay-mica) Group
This group is basically a hydrated microscopic muscovite. The mineral illite is the only common mineral represented, however it is a significant rock forming mineral being a main component of shales and other argillaceous rocks. The general formula is (K, H)Al2(Si, Al)4O10(OH)2 - xH2O, where x represents the variable amount of water that this group could contain. The structure of this group is similar to the montmorillonite group with silicate layers sandwiching a gibbsite-like layer in between, in an s-g-s stacking sequence. The variable amounts of water molecules would lie between the s-g-s sandwiches as well as the potassium ions.

Uses: A common constituent in shales and is used as a filler and in some drilling muds.

The Chlorite Group
This group is not always considered a part of the clays and is sometimes left alone as a separate group within the phyllosilicates. It is a relatively large and common group although its members are not well known. These are some of the recognized members:

Amesite (Mg, Fe)4Al4Si2O10(OH)8
Baileychlore (Zn, Fe+2, Al, Mg)6(Al, Si)4O10(O, OH)8
Chamosite (Fe, Mg)3Fe3AlSi3O10(OH)8
Clinochlore (kaemmererite) (Fe, Mg)3Fe3AlSi3O10(OH)8
Cookeite LiAl5Si3O10(OH)8
Corundophilite (Mg, Fe, Al)6(Al, Si)4O10(OH)8
Daphnite (Fe, Mg)3(Fe, Al)3(Al, Si)4O10(OH)8
Delessite (Mg, Fe+2, Fe+3, Al)6(Al, Si)4O10(O, OH)8
Gonyerite (Mn, Mg)5(Fe+3)2Si3O10(OH)8
Nimite (Ni, Mg, Fe, Al)6AlSi3O10(OH)8
Odinite (Al, Fe+2, Fe+3, Mg)5(Al, Si)4O10(O, OH)8
Orthochamosite (Fe+2, Mg, Fe+3)5Al2Si3O10(O, OH)8
Penninite (Mg, Fe, Al)6(Al, Si)4O10(OH)8
Pannantite (Mn, Al)6(Al, Si)4O10(OH)8
Rhipidolite (prochlore) (Mg, Fe, Al)6(Al, Si)4O10(OH)8
Sudoite (Mg, Fe, Al)4 - 5(Al, Si)4O10(OH)8
Thuringite (Fe+2, Fe+3, Mg)6(Al, Si)4O10(O, OH)8

The term chlorite is used to denote any member of this group when differentiation between the different members is not possible. The general formula is X4-6Y4O10(OH, O)8. The X represents one or more of aluminum, iron, lithium, magnesium, manganese, nickel, zinc or rarely chromium. The Y represents either aluminum, silicon, boron or iron but mostly aluminum and silicon.

The gibbsite layers of the other clay groups are replaced in the chlorites by a similar layer that is analogous to the oxide brucite. The structure of this group is composed of silicate layers sandwiching a brucite or brucite-like layer in between, in an s-b-s stacking sequence similar to the above groups. However, in the chlorites, there is an extra weakly bonded brucite layer in between the s-b-s sandwiches. This gives the structure an s-b-s b s-b-s b sequence. The variable amounts of water molecules would lie between the s-b-s sandwiches and the brucite layers.

Uses: No industrial uses.

Some minerals listed above (specifically chlorite, pyrophyllite and talc) as belonging to one of the clay groups are often excluded by some minerologists. Usually the reason is that their crystal size and character do not consistently conform to the parameters that define a clay. Such minerals are listed here more for their structural similarities. However, all three minerals are quite often found associated with and do behave like clays occasionally.

Last Edit: Nov 25, 2016 10:03:12 GMT -5 by 1dave

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Clay - Tumbling Speed Additive Nov 25, 2016 8:54:09 GMT -5 1dave and MrMike like this

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Post by jamesp on Nov 25, 2016 8:54:09 GMT -5

Well our red clay must be eat up with magnesium.
Start out with 4 pounds of boots and end up with 15 pounds of boots assuming 3 inches of sticky clay stuck to the bottom of them.

Off roaders don't need high revving engines in these parts except for one reason.
They need to rev engine up to spin tires fast enough to sling the mud off the tires to expose the tire tread to get a bite.

My shovels all have suction vents sawed into the blade so that the suction will release when raising the shovel.
Unless you like to use 50 extra pounds of lift to raise 7-8 pounds of clay in the shovel.

Our plow discs wear on the outside edge making them smaller in diameter. Effect of clay.
Sand causes plow discs to get thin and fail from lack of structural strength, rarely decreases diameter.

DOT loves our pasty red clay, when packed to the point the colloids are laying flat it becomes one of the finest road underlayment materials.

Packed red clay makes one of the finest dams in the world. Once packed and colloids are laid flat such a dam will NOT leak.

The gardening community around Atlanta despises their red clay. It takes a 5 foot wrecking bar to break into it.
Dries like concrete and stays wet so long it rots plant roots. Soil amendment business is big biz around here.
Mass composting facilities abound with giant grinders that chop oak tree stumps like confetti.

And all those dang country songs of ours about muddy rivers is due to colloidal clay that does not want to settle to the bottom of the river.

Our Mommy's whip our butts as kids because red clay does not wash out of our clothes.

We buy pick up trucks that hide the color of red clay, avoid white and black.

Gotta love red clay.

I want to know what the conductive and ionic properties of it is. No articles found thus far. Have looked and looked.

Last Edit: Nov 25, 2016 9:00:26 GMT -5 by jamesp

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Clay - Tumbling Speed Additive Nov 25, 2016 10:41:35 GMT -5 1dave likes this

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Post by jamesp on Nov 25, 2016 10:41:35 GMT -5

I knew clays were totally complicated 1dave. As they are usually a mix of other complicated clays.
Not easy to find BASIC info on their conductivity or their individual effectiveness as slurry either.

pauls fully equipped rock polisher Member since May 2013 Posts: 1,172	Clay - Tumbling Speed Additive Nov 25, 2016 15:23:10 GMT -5 1dave likes this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by pauls on Nov 25, 2016 15:23:10 GMT -5 Wow Dave so much information, fantastic. I always knew clay was complex but its not easy to find information thats accesible to amateurs, thanks for a great post.

MrMike freely admits to licking rocks Member since September 2016 Posts: 968	Clay - Tumbling Speed Additive Nov 25, 2016 15:45:41 GMT -5 jamesp and 1dave like this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by MrMike on Nov 25, 2016 15:45:41 GMT -5 1dave & jamesp, bet this guy can help answer your clay ?s: www.clays.org/AskTheClayScientist/Bloch.html

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Clay - Tumbling Speed Additive Nov 25, 2016 18:15:20 GMT -5 via mobile 1dave likes this

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Post by Deleted on Nov 25, 2016 18:15:20 GMT -5

Nov 25, 2016 10:41:35 GMT -5 jamesp said:

I knew clays were totally complicated 1dave. As they are usually a mix of other complicated clays.
Not easy to find BASIC info on their conductivity or their individual effectiveness as slurry either.

I did some googling too.

Looks like low pH will make our slurry last longer too. Unless I read it wrong, then higher pH will last longer. The flocculate differently...

High pH flocs into books, and low pH flocs into house of cards shaped structure...

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Clay - Tumbling Speed Additive Nov 25, 2016 22:48:13 GMT -5 1dave likes this

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Post by jamesp on Nov 25, 2016 22:48:13 GMT -5

Nov 25, 2016 18:15:20 GMT -5 @shotgunner said:

Nov 25, 2016 10:41:35 GMT -5 jamesp said:

I knew clays were totally complicated 1dave. As they are usually a mix of other complicated clays.
Not easy to find BASIC info on their conductivity or their individual effectiveness as slurry either.

I did some googling too.

Looks like low pH will make our slurry last longer too. Unless I read it wrong, then higher pH will last longer. The flocculate differently...

High pH flocs into books, and low pH flocs into house of cards shaped structure...

I am on the low ph side. Never measured it but my skin says it is low. Water is 6.2 -6.7, mostly 6.7. Clay rich water is 6.7. Then the effects of the rocks.

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Clay - Tumbling Speed Additive Nov 26, 2016 8:01:24 GMT -5 MrMike likes this

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Post by 1dave on Nov 26, 2016 8:01:24 GMT -5

A little about jamesp 's Red Clay:

Formation

KAOLIN GEOLOGY IN MIDDLE GEORGIA

1. Between 50 and 100 million years ago, during the geological periods known as Cretaceous and Tertiary, the Atlantic Ocean covered much of Georgia south of an imaginary line drawn from Columbus to Augusta, which is where the Piedmont Plateau meets the coastal plain.

Above this line, known as the Fall Line, weathered crystalline rocks at the Piedmont Plateau began to break down and rushing streams carried the tiny feldspar and kaolinite crystals seaward to form large sedimentary deposits. During later periods, earth was piled on top of the kaolin; this overlying layer of earth contained sharks’ teeth, sand dollars and other marine life fossils and contributed to the alteration of the feldspar and kaolinite deposits. Sedimentary kaolin deposits were formed in middle Georgia as a result of the weathering and erosion of the Piedmont rock, enriching the lives of Georgians who reside along the Fall Line.

2. THE FALL LINE

The origin of kaolin can be traced to the Cretaceous geologic period, about 70 million years ago when dinosaurs roamed the earth and much of the southern half of Georgia was covered by a great sea. The climate was more tropical than now. The seacoast stretched across Georgia from Columbus to Macon to Augusta along a line that we now call the "Fall Line" where the Piedmont gives way to the coastal plains.

3. WEATHERING OF THE PIEDMONT ROCKS

50-56 million years ago - CRETACEOUS PERIOD

Weathering of the rocks of the Piedmont generated large volumes of kaolinitic clays, quartz sand and mica, as well as minor amounts of other minerals, especially iron and titanium oxides, such as limonite and anastase. Feldspar, a major component of granitic rocks such as those at Stone Mountain near Atlanta, is considered the parent material for most of Georgia's sedimentary kaolin.

4. TRANSPORTATION AND DEPOSITION OF SEDIMENTS

50-65 million years ago

Washed into rivers and streams, the weathered clays and sands of the Piedmont were transported and deposited in swamps, marshes and lagoons near and along the coastline of the ancient sea. Iron and titanium oxides were often deposited along with the kaolin, contaminating and making much of the kaolin unusable for commercial applications.

5. TRANSPORTATION AND DEPOSITION OF SEDIMENTS

Changes in the sea level interrupted the sequence of erosion, transportation and deposition of kaolin from the Piedmont, but the process continued for some 30 to 35 million years. The last invasion of the land by the great sea deposited huge amounts of red and brown sands and clays over the kaolin deposits. These later sediments formed the characteristic red hills of Middle Georgia. They covered many of the kaolin deposits with more than 200 feet of material, rendering these deposits uneconomical to mine. A typical cross-section of Coastal Plains Sediments showing the bedding or layering of the sediments and the position of the kaolin beds.

6. THE KAOLIN BELT

Kaolin is one of the many industrial minerals mined in Georgia today. The commercially mineable kaolin deposits are found in a relatively narrow "belt" along the Fall Line. The kaolin mining industry has located its processing facilities in the communities near the deposits, primarily in the nine rural counties between Macon and Augusta. Highly technical equipment and processes are employed to transform the crude kaolin into high quality products which are marketed around the world for a wide variety of applications.

So James' Red Clay weathered out later and sits on top of the Kaolin. Now, How good is it in tumbles?

Last Edit: Nov 26, 2016 8:21:44 GMT -5 by 1dave

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Clay - Tumbling Speed Additive Nov 26, 2016 8:23:02 GMT -5 1dave, Garage Rocker, and 1 more like this

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Post by jamesp on Nov 26, 2016 8:23:02 GMT -5

Yes 1dave. The red clay I get is above the fall line in Atlanta. The red clay hills ! Exactly.

Carnegie, Rockefeller, Dupont made fortunes off of oil, real estate, railroads, chemical products, etc.

Little known J.M. Huber made his fortune digging clay and probably had a financial empire rivaling the above.
Almost every piece of coated paper, paint, cosmetic uses lots of kaolin.

His mines can be seen from the most distant satellite photos, large operations.

Red clay over burden, white kaolin below. Big operation as far as eye can see

Using a berm to keep the white kaolin from getting stained by the red clay. Neutral white color desirable for paint and paper coatings.

Last Edit: Nov 26, 2016 8:26:21 GMT -5 by jamesp

1dave misunderstood rock expert Awed by the Universe! Member since October 2013 Posts: 11,944	Clay - Tumbling Speed Additive Nov 26, 2016 8:55:55 GMT -5 Garage Rocker likes this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by 1dave on Nov 26, 2016 8:55:55 GMT -5 So now YOU have found a use for the previously useless!
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Clay - Tumbling Speed Additive Nov 26, 2016 9:18:06 GMT -5 1dave likes this

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Post by jamesp on Nov 26, 2016 9:18:06 GMT -5

Nov 26, 2016 8:55:55 GMT -5 1dave said:

So now YOU have found a use for the previously useless!

Between you and the wall I took the above photos whilst stealing pure white kaolin to try in the tumbler.
And it did not hold a candle to pasty red clay. That is when I surmised there must be some other property other than just colloids at work.

I wet the stolen kaolin and spent time breaking it down with a maul. Then mixing it with water with a motor driven grout mixer.
Then let it dry into a big cake for breaking into dose size chunks for the tumbler.

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Clay - Tumbling Speed Additive Nov 26, 2016 9:50:48 GMT -5

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Post by 1dave on Nov 26, 2016 9:50:48 GMT -5

The new knowledge is that the slurry is as important as the abrasive.

So the kaolin ( Al2Si2O5(OH)4. ) lacks the iron and magnesium. Is the iron necessary?

The black gumbo from Kansas sticks to your shoes - up to SIX INCHES!

Last Edit: Nov 26, 2016 10:00:28 GMT -5 by 1dave

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Clay - Tumbling Speed Additive Nov 26, 2016 10:08:48 GMT -5 1dave likes this

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Post by jamesp on Nov 26, 2016 10:08:48 GMT -5

Nov 26, 2016 9:50:48 GMT -5 1dave said:

The new knowledge is that the slurry is as important as the abrasive.

So the kaolin ( Al2Si2O5(OH)4. ) lacks the iron and magnesium. is the iron necessary?

The black gumbo from Kansas sticks to your shoes - up to SIX INCHES!

I will guarantee that electrical conductivity and ion type attraction forces have all-to-do with clay slurries.
I have no knowledge on the subject of conductivity.
But suspensions in ALL types of slurries be it for drilling or carrying ore particles or whatever have performance related to high conductivities.(reading articles)
Perhaps iron is the reason for a high conductivity ? Reduced silica and high clay content raises conductivity, that's a fact.

Kaolin has another benefit when tumbling. It is like 30% aluminum oxide.
And after the coarse SiC breaks down I believe the AO in the kaolin slurry is laying down a fine pre-pre-polish finish.
Take the rocks out of some well broken down SiC 30 running in the rotary and put them in the vibe with AO 500 and they have a darn nice polish the next day.
Just a by product.

Main goal is to have a slurry that carries bigger SiC particles with high attraction(suction) forces to grind rocks faster.
Coarse grind sloooow

Last Edit: Nov 26, 2016 10:16:44 GMT -5 by jamesp

1dave misunderstood rock expert Awed by the Universe! Member since October 2013 Posts: 11,944	Clay - Tumbling Speed Additive Nov 26, 2016 10:25:44 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by 1dave on Nov 26, 2016 10:25:44 GMT -5 Sodium increases conductivity in water.
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Clay - Tumbling Speed Additive Nov 26, 2016 10:37:17 GMT -5 1dave likes this

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Post by jamesp on Nov 26, 2016 10:37:17 GMT -5

Nov 26, 2016 10:25:44 GMT -5 1dave said:

Sodium increases conductivity in water.

Could it be ? We are not normally salty up this way. I suppose clay being agitated when wet may have a lot of things going on in it.
Conductivity causing molecular attraction ? No clue Dave.

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Clay - Tumbling Speed Additive Nov 26, 2016 11:46:22 GMT -5 via mobile 1dave likes this

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Post by Deleted on Nov 26, 2016 11:46:22 GMT -5

Nov 26, 2016 10:37:17 GMT -5 jamesp said:

Nov 26, 2016 10:25:44 GMT -5 1dave said:

Sodium increases conductivity in water.

Could it be ? We are not normally salty up this way. I suppose clay being agitated when wet may have a lot of things going on in it.
Conductivity causing molecular attraction ? No clue Dave.

The charges in the clay particles are more like a static charge. Experimentation is needed, but I suspect adding salt to the slurry will actually kill it's ability to do its job.

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Clay - Tumbling Speed Additive Nov 26, 2016 11:49:21 GMT -5 via mobile

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Post by Deleted on Nov 26, 2016 11:49:21 GMT -5

Nov 26, 2016 9:50:48 GMT -5 1dave said:

The new knowledge is that the slurry is as important as the abrasive.

So the kaolin ( Al2Si2O5(OH)4. ) lacks the iron and magnesium. Is the iron necessary?

The black gumbo from Kansas sticks to your shoes - up to SIX INCHES!

There are grades of kaolin clay. Not really 'pure' vs not. The white stuff likely doesn't stick to boots like gumbo, or Jims red, or even the stuff a Salton sea sticking 6+" as well. I bet all of those sticky ones will work. Iron or not. The sticky nature is due to shapes of particles...

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Clay - Tumbling Speed Additive Nov 26, 2016 12:15:55 GMT -5

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Post by 1dave on Nov 26, 2016 12:15:55 GMT -5

Just stating a fact on salt. ALL metals are conductive.

Conductivity Of Metals Sorted By Resistivity
Source Code:
1 - CSNDT
2 - Eddy Current Testing Manual on Eddy Current Method
3 - NDT Magazine Sept/Oct 1955, Cosgrove Article

RESIST. COND. SOURCE
ohm-m SIEMENS/m % IACS CODE MATERIAL
----------------------------------------------------------------------------------
1.591E-08 6.287E+07 108.40 1 Silver, Pure
1.642E-08 6.090E+07 105.00 2 Silver, Pure
1.664E-08 6.009E+07 103.60 1 Copper, Pure
1.707E-08 5.858E+07 101.00 1 Copper, Electrolytic Tough Pitch (Annealed)
1.724E-08 5.800E+07 100.00 2 Copper, Pure
2.028E-08 4.930E+07 85.00 1 Copper, Deoxidized (Annealed)
2.349E-08 4.257E+07 73.40 1 Gold
2.463E-08 4.060E+07 70.00 2 Gold, Pure
2.655E-08 3.767E+07 64.94 1 Aluminum, 99.99%
2.826E-08 3.538E+07 61.00 2 Aluminum, Pure
2.871E-08 3.483E+07 60.00 - 60.10 3 Aluminum Alloy, 7072
2.903E-08 3.445E+07 57.00 - 61.80 3 Aluminum Alloy, 1100
2.922E-08 3.422E+07 59.00 1 Aluminum, 2S Cond. "0"
3.025E-08 3.306E+07 57.00 1 Aluminum, 2S Cond. H18
3.073E-08 3.254E+07 55.70 - 56.50 3 Aluminum Alloy, 6951-0
3.079E-08 3.248E+07 56.00 1 Gilding Metal (Annealed)
3.135E-08 3.190E+07 55.00 1 Aluminum, A51S Cond. "0"
3.184E-08 3.141E+07 53.30 - 55.00 3 Aluminum Alloy, 6151-0
3.235E-08 3.091E+07 52.30 - 54.30 3 Aluminum Alloy, 4043-F
3.250E-08 3.077E+07 53.00 - 53.10 3 Aluminum Alloy, 6951-F
3.281E-08 3.048E+07 52.30 - 52.80 3 Aluminum Alloy, 5005
3.435E-08 2.912E+07 50.10 - 50.30 3 Aluminum Alloy, X3005-0

Conductivity is just the opposite of resistance.

Relationship Between Conductivity and Resistivity

Electrical conductivity (σ) is the reciprocal of the electrical resistivity (ρ):

σ = 1/ρ
where resistivity for a material with a uniform cross section is:

ρ = RA/l
where R is the electrical resistance, A is the cross-sectional area, and l is the length of the material

So instead of all the expensive equipment you can just use a simple meter from Walmart or Home Depot.
meter