Tetrahedrite

• named after its common outer shape – a tetrahedron
• because of its relative high copper content it is also a (minor) ore of copper
• Formula: Cu₁₂[S|(SbS₃)₄]
• Space group: I-43m (No. 217)
• Crystal system: cubic
• Crystal class: -43m
• Lattice parameters: a = b =  c = 10.448 Å, α = β = γ  = 90°

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Picture: Carles Millan – http://www.mindat.org/photo-176605.html  | CC BY-SA-3.0

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Crystal structure (click on the picture to download the VESTA file):

(K. Momma and F. Izumi, “VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data,”J. Appl. Crystallogr., 44, 1272-1276 (2011).)

• SbS₃ pyramids (purple)
• CuS₃ trigonal planar coordination (cyan)
• CuS₄ tetrahedra (blue)
• Copper (blue)
• Sulfur (yellow)
• Antimony (purple)

For a 3D interactive version on sketchfab, see here:

https://skfb.ly/6Or6R

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