Posted by RobertIceberg (+16) 9 years ago
In the area of Miles City is there a local geologist to be able to identify rocks and crystals found in the county?
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Posted by BigDryBug (+65) 9 years ago
Larry French knows his stuff.
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Posted by Amorette F. Allison (+1906) 9 years ago
I know the Range Riders Museum has had someone coming in and sorting and grading their stuff. The BLM also is bound to have a geologist lurking around somewhere.
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Posted by Gunnar Emilsson (+18248) 9 years ago
You can also post here. Describe it, post a picture, where you found it, etc. and I will take a crack at it.

Gunnar Emilsson
Wyoming Registered Professional Geologist No. PG-643
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Posted by Gunnar Emilsson (+18248) 9 years ago
http://en.wikipedia.org/wiki/Concretion

An early start. I may be wrong.
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Posted by ike eichler (+1228) 9 years ago
Many are, indeed, concretions. A few fossils and calcite crystals.
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Posted by Oddjob (+184) 9 years ago
Just a SWAG. From the color and crystal habit it looks like native sulfur growths and concretions to me. If so, the crystals should be soft and scratch easily with a nail or knife blade. You can also test (in a well ventilated area!) by crushing and burning a small sample. It should burn with a distinctive blue flame and an unpleasant "rotten-egg" smell. That will be sulfur-dioxide and/or hydrogen-sulfide gas, so don't overindulge.
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