Goethite covered pyrite twin (iron cross). Penetration twin of two pentagonal dodecahedrons, whose twinning plane is the rhombic dodecahedron. These "floater" Pyrite crystals show the classic and dramatic twinning within pyrite known as "iron cross twin".

Location Guavió-Guatéque mining district, Cundinamarca Department, Colombia

Hardness 6-6.5

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