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Minerals / Pyrite on Dolomite, Tan y Foel quarry.

Pyrite, FeS2, and Dolomite, CaMg(CO3)2. Tan y Foel quarry, Nr Adfa. central Wales. Minute cubic crystals of pyrite deposited on larger cubic crystals of dolomite. Two groups of crystals,some are brassy yellow and definitely pyrite, and some are almost black and possibly magnetite.  

Pyrite on Dolomite, Tan y Foel quarry. Bill Bagley Rocks and Minerals



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