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Could you please identify this mineral?

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I've attached three photos of a mineral I bought at a tag sale today just because it was pretty and unusual. I have no experience in this area. A brief internet search made me think it might be Olivine.  It also led me to your website.   Thanks for any assistance you can provide!



asked Jun 19, 2016 by Heather (120 points)

1 Answer

+1 vote
I have seen fluorite looking like that, so fluorite would be a likely candidate. It's not the right color for olivine, and olivine doesn't have banding like your picture indicates. The luster on your specimen does not look natural - it looks like it was oiled or lacquered.
answered Jul 24, 2016 by hershel (51,840 points)
Just a thought, could it be calcite? I have a multicolored specimen and the green looks similar.
Yes, it can definitely also be calcite. That's a good possibility. A hardness test can be done to distinguish between calcite and fluorite. Another test can be to see if it effervesces in acid - calcite will effervesce and fluorite will not.

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