Formula: (Ag,Cu)16(As,Sb)2S11
Reflected/transmitted colour: opaque, translucent dark red in thin splinters
Pleochroism: weak in reflected light
Optical isotropy/anisotropy: biaxial, moderate
Optical sign: -
Refractive indices: n > 2.71
Birefringence δ:
2V angle: 22°
Dispersion: very strong
Optical orientation: α = c, γ = a
Optical axial plane:
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