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Identity HelpHelp Id: black fan shaped mineral

12th Sep 2019 02:40 BSTAli U.

Got this off eBay from a seller that I would not trust to know the locality or species.

 Have any of you seen it before?

I know it's probably not epidote or tourmaline. 

It's color is black with a metalic luster. 

12th Sep 2019 04:26 BSTEric He

Could be a spray of goethite. Unsure of locality, just know that Colorado has produced some good ones.

12th Sep 2019 04:29 BSTWilliam W. Besse Expert

Looks a lot like kyanite from Ribeirão da Folha, Minas Novas, Minas Gerais, Brazil.

Could use a couple more photos to make sure, including side. If you know how, check the hardness for kyanite.


12th Sep 2019 18:32 BSTAli U.

This is definitely the correct ID. Thank you!!!

12th Sep 2019 05:52 BSTDana Slaughter

Agree with Bill--one of the graphite-included kyanites from Brazil. These were quite common on the market a few years ago.

12th Sep 2019 18:35 BSTAli U.

I agree. That looks like it.

12th Sep 2019 09:50 BSTAlfredo Petrov Manager

I agree with Bill and Dana. For a while in the 90s this material was being sold by species dealers with the names of incredibly rare amphiboles attached, but a simple hardness test will quickly confirm that it is kyanite (the directional difference in hardness).

12th Sep 2019 18:34 BSTAli U.

Thanks for mentioning the hardness variance at various angles. Ill have to test that tonight

12th Sep 2019 10:35 BSTRui Nunes Expert

Black kyanite, locally known as "witch's broom" 

12th Sep 2019 18:33 BSTAli U.

Thank you!!! This plus the comments above helped ID it.

12th Sep 2019 18:35 BSTAli U.

Thank you everyone you guys ROCK!

Looks a lot like kyanite from Ribeirão da Folha, Minas Novas, Minas Gerais, Brazil.

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