Mineral: Pyrite coated by Molybdenite
Locality: Rico Claims, Grayback District (Russell District), Costilla County, Colorado, USA
Dimensions: 6.5x4.5x2.5 cm's

Description: I purchased this piece as an oddity with hopes of getting some clarification at a later date. It is a cluster of pyrite crystals with a silver coating of what is purported to be "bravoite" (FeNi)S2.There appears to be some controversy with the specimens from this particular locality and I haven't been able to fully determine if the coating is actually just a coating such as galena.

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