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What Rock Is This?

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What Rock Is This? Empty What Rock Is This?

Post  adrian ss Fri Jun 17, 2022 3:01 pm

Any cabochon cutters out there who might know what rock this is?
RI 2.54 fibrous structure, lots of fine shiny black specks throughout, Pale purple colour, non uv reactive. Not lapis or sodalite.
What Rock Is This? Rscn4215

What Rock Is This? Rscn4216
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Post  Kon61gold Fri Jun 17, 2022 4:58 pm

Looks like a polished cabochon of "Charoite" Adrian

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Post  adrian ss Fri Jun 17, 2022 5:11 pm

Yes mate that is what I thought but that stuff is very rare and so I was swayed away from it. I can not think what else it could be tho?....It seems to be very, very, very weakly attracted to a very strong magnet.
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Post  Kon61gold Fri Jun 17, 2022 5:51 pm

The black spots visible on charoite are most likely Aegirine.
Aegirine (chemical composition NaFeSi2O6) in which iron is known to be present in the form of Fe3+ mixed in with charoite, hence its very weak magnetic properties.
Less the stone is synthetically or laboratory made? V19
BTW, the stones setting, wouldn't have the presence of any iron in it, would it?  Shocked

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Post  adrian ss Fri Jun 17, 2022 6:23 pm

Setting is stamped and tests as 925 sil although the metal back of the setting is more attracted to the magnet than the cab side??    Might be dodgy silver?
    Looks like a Ruski setting design.
Charoite it is.
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