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Fluorite threelobes https://www.gemologyonline.com/Forum/phpBB2/viewtopic.php?f=86&t=23977 |
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Author: | 75TURBO [ Tue Sep 19, 2017 5:29 am ] |
Post subject: | Fluorite threelobes |
HI, I own some violet cabs: at first look, they look like amethyst. After investigation, S.G. and R.I. (spot reading) are in the range of fluorite. Under LW UV the stones are fluorescent and at 130°C they are thermoluminescent. Under microscope, the color zoning are different from the others fluorite I have seen. I mean color zones are in the shape of "threelobes". A little help: Any comment will welcome. |
Author: | Stephen Challener [ Tue Sep 19, 2017 3:26 pm ] |
Post subject: | Re: Fluorite threelobes |
'Mercedes logo' zoning is sometimes seen at larger scales in fluorite, particularly Illinois ones. Here's one from Spirifer minerals: I've never seen them at this scale though--that's really interesting! |
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