Biotite - search on eBay
Biotite is a common phyllosilicate mineral within the mica group. It is also sometimes called "black mica" as opposed to "white mica" (muscovite) -- both form in some rocks, in some instances side-by-side. Biotite was named by J.F.L. Hausmann in 1847 in honour of the French physicist Jean-Baptiste Biot, who, in 1816, discovered optical properties of micas. Biotite - search on eBay here.
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Some Biotite specimens on eBay
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