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Description
Mineral(s): Pyrite, with minor Jamesonite and Dickite
Locality: Animas Mine, Potosí Department, Bolivia

Barely over a centimeter across, this tiny specimen is basically a number of intergrown pyrite crystals in a distinct shape. Pyrite often forms in cubic crystals, but here we see octahedral (8-sided bipyramidal) crystals. The crystals also seem to have a thin veneer of oxidation, creating interference colors that show a very slight rainbow-like iridescence. Also, if you look closely, you'll see black metallic needles of jamesonite (another sulfide like pyrite) and white powdery dickite (a clay mineral).

Pyrite is a common sulfide mineral that has been dubbed "fool's gold".

Description
Mineral(s): Pyrite, with minor Jamesonite and Dickite
Locality: Animas Mine, Potosí Department, Bolivia

Barely over a centimeter across, this tiny specimen is basically a number of intergrown pyrite crystals in a distinct shape. Pyrite often forms in cubic crystals, but here we see octahedral (8-sided bipyramidal) crystals. The crystals also seem to have a thin veneer of oxidation, creating interference colors that show a very slight rainbow-like iridescence. Also, if you look closely, you'll see black metallic needles of jamesonite (another sulfide like pyrite) and white powdery dickite (a clay mineral).

Pyrite is a common sulfide mineral that has been dubbed "fool's gold".