Description: Pyrite, quartz, calcite? Huanzala Mine, Huallanca District, Dos de Mayo Province, Huánuco Department, Peru 71 mm x 52 mm Pay attention to the octahedron {111}, pyritohedron {210} and the uncommon (in pyrite) rhombododecahedron {110} faces. Anyone interested to learn what the Miller indices are can get a primer from the Wikipedia at http://en.wikipedia.org/wiki/Miller_index

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