montagieu
starting to shine!
Member since March 2008
Posts: 28
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Post by montagieu on Mar 15, 2008 0:29:40 GMT -5
I get to travel up to the Oklahoma Panhandle quite frequently with my job. I collected some of these rocks on the company clock, don't tell my boss... I would appreciate some I.D. help.  I think this is a piece of quartz with some cool banding.  I have no idea...  I have no idea...  I REALLY have no idea...  A better close up. I am really interested in finding out what the rocks in the last two pictures are. They are in abundance, but want to make sure they are worth the time and effort. -Montagieu |
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Post by Jack ( Yorkshire) on Mar 15, 2008 3:41:19 GMT -5
Hi
How hard are they ?
Have you "tried to cut them" with a knife !! If it leaves a scratch its less than 7 if it leaves a slaty blue mark its higher and will polish well,
This could also help in Identifing them
I will leave this to the expert Geoligist's among us.
Jack
Yorkshire UK
Jack
Yorkshire UK
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Post by krazydiamond on Mar 15, 2008 15:03:17 GMT -5
those last two photos look interesting, they may make an excellent tumbling material if they aren't too soft!
no clue of what they may be tho!
KD
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DeanW
has rocks in the head
Member since December 2007
Posts: 721
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Post by DeanW on Mar 17, 2008 8:45:28 GMT -5
The last two look to my to be either a silicified (sp?) sand stone, or a rhyolite material. Similar to Utah & Nevada "Wonderstone" or "Hickoryite" (popular names for different rhyolite materials). Throughout the southwest (AZ, NM, etc) gift shops sell these materials in various shapes for display pieces. I'll look for some examples of the gift shop ones.
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SirRoxalot
freely admits to licking rocks
Member since October 2003
Posts: 790
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Post by SirRoxalot on Mar 17, 2008 10:43:01 GMT -5
Do a hardness test; if the last photos are hard like quartz, about 7, and solid, not crumbly, you're in luck, and I'd suggest picking up all you can find. Looks like a jasper or flint to me, neat stuff. Top photos look like quartz, maybe feldspar, spotted stuff I dunno.
SirRoxalot
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montagieu
starting to shine!
Member since March 2008
Posts: 28
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Post by montagieu on Mar 17, 2008 21:21:35 GMT -5
Everyone... Thanks for the responses and ideas.
A quick update. I used a galvanized nail to do a scratch test on the 2 last rock types in the pictures. They do no crumble, but are scratched by the nail (galvanized steel...MOH's=7??). I think I will just try a homogeneous batch of that rock in 60/90 and see if it falls apart. It may not take a good shine, but it has an interesting pattern and might look good shaped and semi-polished.
-Montagieu
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stefan
Cave Dweller 
Member since January 2005
Posts: 14,113
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Post by stefan on Mar 19, 2008 8:32:53 GMT -5
First rock is a banded Gniess or Schists- they tumble pretty good- second rock is a conglomerate- not worth the effort- as they tend to fall apart. 3rd rock looks like an iron stained sandstone- MIGHT be worth a go as some of the ironstianed sandstones have strated to metamorph into quartzite. Last rock is interesting- At first I thought a flint or chert complex- but if a nail scratches it then I'll have to agree on the Rhyolite call- still might be worth a go.
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Post by Tonyterner on Mar 19, 2008 9:05:30 GMT -5
Mohs hardness for steel is around 5.5. Galvanized steel might only be a 5.
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