Formula: (Ag,Cu,Zn,Fe)12(As,Sb)4S13
Reflected/transmitted colour: opaque, polished section light gray to greenish gray
Pleochroism:
Optical isotropy/anisotropy:
Optical sign:
Refractive indices:
Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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