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Post by fernwood on Jun 25, 2018 16:09:17 GMT -5
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Deleted
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Post by Deleted on Jun 25, 2018 17:08:02 GMT -5
I've seen slabs of fluorite that look similar (try a scratch test). If harder, perhaps vesuvianite.
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Post by fernwood on Jun 25, 2018 17:13:04 GMT -5
I could scratch with a metal file. The brown veins intrigue me, as does the red spot.
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Post by beefjello on Jun 25, 2018 17:26:55 GMT -5
I had always guessed Italian or Pakistani onyx, but I really don't know. It will be great if you get a proper ID here
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Post by MsAli on Jun 25, 2018 17:29:16 GMT -5
It does look like Italian Green Onyx
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Post by Deleted on Jun 25, 2018 18:25:45 GMT -5
Try scratching with a regular (unhardened) wire nail. Vesuvianite (aka, Californite, idocrase, Pulga jade, etc.) shouldn't scratch, while fluorite or calcite (aka, "onyx") will.
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Post by fernwood on Jun 26, 2018 5:52:36 GMT -5
Nail test was positive.
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Post by Deleted on Jun 26, 2018 12:11:31 GMT -5
Next easy step would be to add a drop of muriatic acid (or strong white vinegar may do, though the reaction won't be as obvious) to the scratch and look under magnification for any sign of bubbling. Bubbling would be a further indication of calcite (the material that makes up most of what is mis-labeled as "onyx"). Note, do not use sulfuric acid to test or clean anything which may be (or contain) fluorite. This can produce hydrofluoric acid, which can kill you even in small amounts.
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