Cubanite
Chemical compound
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Cubanite is a copper iron sulfide mineral that commonly occurs as a minor alteration mineral in magmatic sulfide deposits. It has the chemical formula CuFe₂S₃ and when found, it has a bronze to brass-yellow appearance. On the Mohs hardness scale,... Wikipedia
Cleavage: Parting on, and
Crystal class: Dipyramidal (mmm); H-M symbol: (2/m 2/m 2/m)
Crystal habit: Crystals elongated to thick tabular, striated also massive
Crystal system: Orthorhombic
Formula (repeating unit): CuFe2S3
Optical properties: Distinctly anisotropic on polished surface