Formula: (Cu,Zn)11(Ge,As)2Fe4S16
Reflected/transmitted colour: opaque, polished section orange-brown, similar to bornite, but does not tarnish
Pleochroism: orange to brown or bronze with violet tint
Optical isotropy/anisotropy: polished section distinct to strong anisotropic, yellow-brown to dark brown or grayish yellow to bluish gray
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section distinct, orange to bronze with a violet tint
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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