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1,721 questions

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Need help identifying a stone - Quartz? Mexican Opal I was told.

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I purchased this rock at a garage sale. I believe the person told me it was mexican opal, but I think it might be amethyst? It is 8" wide, 6" deep and 4" high. It weighs about 4 lbs. I don't know enough about rocks but I think I saw a raw amethyst rock that is similar. I probably overpayed at $35 so I would like to know more about it. Thanks folks! - Karialt text

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https://lh5.googleusercontent.com/-ZCPyjjN-jq8/UXQ2FwQJ1QI/AAAAAAAAAFU/GfSDb7bMBqc/s512/IMG_6981.JPG?gl=US

asked Apr 21, 2013 by rock_dummy (200 points)

4 Answers

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Okay, after further inquiries, I think this might be sodalite. It is just so purple instead of blue. Anyone agree?

answered Apr 22, 2013 by rock_dummy (200 points)
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Okay...I asked Tim at 'Cigar Box Rocks' and he said it is probably..."Tiffany stone. That is a slang work for Bertrandite. The best way I can describe it is a type of Opalized Fluorite." I think this makes it much more valuable now. $35 does not sound like so much now.

answered Apr 23, 2013 by rock_dummy (200 points)
0 votes

remninds me of my specimen of charolite

answered Apr 23, 2013 by caalr (240 points)
0 votes

Well, it definitely doesn't look like opal or amethyst. Try scratching it with a knife and if it scratches, that will rule out amethyst. It looks most like fluorite. It is too purple to be sodalite, though the variety hackmanite can be purple. Does it fluoresce at all?

answered Apr 24, 2013 by hershel (46,460 points)
definitely neither opal nor amethyst....

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