Casapalca Mine, Casapalca, Huarochiri Province, Lima, Peru

Cu₆[Cu₄(Fe,Zn)₂]Sb₄S₁₃

Crystal System: cubic
Colour: steel- to iron-gray
Habitus: usually as massive or coarse-to-fine grained aggregates, rarely as tetrahedral crystals
Lustre: metallic
Hardness: 3-4.5
Cleavage: absent
Fracture: sub-conchoidal
Density: 4.99 g/cm³
Origin and geological occurrence:  typical of hydrothermal veins of low- to medium-T

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Samples:

2.15 Tetrahedrite  Anhedral to subhedral crystals with baryte and fluorite, with green coating of malachite. Buca dell’Angina, Stazzema, Lucca, Tuscany #sulfides