Glass saga 2020, 2 new bricks February 26

And some close ups of failed flame attempt. On back lit pic the bottom was the bottom of the brick

forum.rocktumblinghobby.com/thread/62933/identifying-rocks-6-basic-tests
4. Weight - Specific Gravity:

If you pick up two rocks of a dissimilar nature but of about the same volume you can easily determine which seems heavier just by holding them. You can fairly easily determine exactly the difference in weight of the two by using a principle discovered around 250 BC by a Sicilian named Archimedes.
Legend has it that Archimedes was so excited about his discovery that he ran naked through the streets of Sicily shouting Eureka! Eureka! (Greek for “I have found it!”).

The discovery was to compare the weight of objects in and out of water, the results are called the "specific gravity."
The formula is simple:



Perhaps you have a coin and want to know if it is GOLD or brass.

Alessandro can show you exactly how to do it! He simplified the formula to:
Coin dry weight / weight of water that has the volume of the coin =? Check out:
Coin Sp. Gr.
www.attilacoins.com/Calculate_Specific_Gravidity_coin.asp






Back to rocks.
If you know the name of a rock there are all kinds of places that can tell you what it's specific gravity is.
If you don't, it is easy to determine and the name usually speedily becomes apparent.

Average Specific Gravities:
Minerals of Nonmetallic Luster have an average specific gravity between 2.6 and 3.
Quartz = 2.66; the Feldspars = 2.6 - 2.75; Calcite = 2.7; Muscovite = 2.8
A specific gravity below 2.5 is LOW!
Gypsum = 2.3; Diamond = 2.26
A specific gravity above 3 is relatively high.
some common minerals like Fluorite = 3.175–3.184 (to 3.56 if high in rare-earth elements); Tourmaline = 3.02-3.26; Apatite = 3.1-3.2; Vesuvianite (Idocrase) = 3.3 - 3.5; Amphibole = 3.1-3.3; Pyroxene = 3.0 to 4.0.; Epidote = 3.3–3.6, are all between 3 and 3.5
A specific gravity above 3.5 Is HIGH, found only among the hard minerals like Corundum = 4, or those containing heavy metals.

Minerals of Metallic Luster have an average specific gravity around 5.
Pyrite Hematite etc.
In this group, below 4 is LOW.
Graphite = 2; Aluminum = 2.55-2.8; Stibnite = 4.5;
Above 7 is relatively high.
Cast Iron = 7.2; Galena = 7.5;
Above 10 is HIGH!
Lead = 11.34; Gold = 19.32; Iridium = 21.78 - 22.65;

exactly 1dave

I could specific gravity test for absolute accuracy.

However, studying past melts has revealed the higher sg glasses.
They are the colors that sank.

What I want to know now is why the burgundy glass is so dang heavy. why
What element/metal/compound have they mixed into it ?

It bullied it's way down to the bottom of this melt too. And cause a push out of the other colors.
So if you piled it high in the center of the mold it would push all other colors to the side and then upward.

Done commonly Alison. All you need is leathers/protective gear. Open kiln at 1400-1500F and stir away.
Might be more common with flat melts like plates.
You might do better arranging colors by placement for bricks, not sure.

My wife (well she calls me SS). The first word is stupid. Let me know that the flames colors were backwards and she stands correct.
I told her backward suites me because the whole 25 slab brick sold minutes after posting which seemed to muffle her little attack.
So, I cut more glass. Same exact colors, burgundy/yelow opal/light orange opal/darker orange opal. 4 total eh ?

This time I cut the oranges and yellow in half again so they would be lower to the bottom of the brick, wider, and have a longer trip rising toward the top.
and of course did yellow-orange 1-orange 2-orange 1-yellow instead of orange 2-orange1-yellow-orange 1-orange 2 as she kindly brought to my attention.
That would be yellow on outside of flame, darker orange on inside of flame, light orange still between them.

So the oranges and yellow sit way low in the mold and the burgundy sheets rise well above them.
It may not matter, when the whole mess turns to liquid the yellow/oranges may decide to float to the top regardless of the distance .

Here is the backward colored flame:

Snails and hurricanes can be described by Fibonacci sequence for example. Derived in 1202 AD. Things that cause brain damage if you try to figure it out



The Fibonacci Sequence is the series of numbers:

0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ...

The next number is found by adding up the two numbers before it.

The 2 is found by adding the two numbers before it (1+1)
The 3 is found by adding the two numbers before it (1+2),
And the 5 is (2+3),
and so on!



Later this week in NEUS



Those are 2 dimensional, we were assigned 3 dimensional in school, 1dave can do 5 dimension Fibonacci

oh yea, sunflowers



mathematical relationships

Oh yea, this one out yesterday. Glass blower's scraps.
Was useless, brittle, because of white glass. Beautiful door stop.
I had to try using glass blower's scraps with heavy white opal content.
Hate white, bricks require too much temp for white glass, shame.






Too brittle in middle of brick for 6 inch knives but perfect for short arrowheads from perimeter

Am I missing something?  Why do you say it is backwards?



Search online for flames.  Some have yellow inside, some outside.

jamesp
ETA - Doesn't matter a whole hell of a lot, as long as they are flying out the door, lol.

Re., buying new material.  Are you going to increase your prices to cover it, or just eat it?  Always a problem when you are incorporating discounted/discontinued (cheap, had for a song) material.  Been there, done that.  Bought scrap from salvage yard for a product.  When it was used up, could no longer get that material.  Had to discontinue the product.  Customers did not understand why I wasn't going to eat the HUGE cost difference.  They didn't know what a good deal the scrap had been.