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greyhair biker
Joined: 04 Oct 2005
Posts: 3550
Location: GreenRiver, Wy
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| Posted: Tue Jul 08, 2008 9:35 pm Post subject: |
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| my first guess without handling it and ph testing would also be gypsum. trona is much more crystalline. this looks like it would flake off in sheets. i've seen similar deposits up here in SW WY but you'd have to do some testing to be absolutely sure. :ne_nau: |
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rockgremlin
Joined: 09 Dec 2004
Posts: 4071
Location: Hotel California
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| Posted: Wed Jul 09, 2008 5:55 am Post subject: |
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My vote was for Gypsum until you said that you cannot scratch it with a fingernail. Gypsum is easily scratched with a fingernail.
My next guess would be possibly calcite. Quartz has a different "look" to it than the rock in your photo.
See if you can scratch it with a nail. If it scratches easily in one direction with a nail, it's likely calcite.
Where did you find it? |
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Iceaxe
Joined: 07 Mar 2005
Posts: 7806
Location: Local Bordello
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| Posted: Wed Jul 09, 2008 8:45 am Post subject: |
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Skylinerider wrote: Well, now it sounds like youve found kryptonite.
:roflol: :roflol: :roflol: |
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