Formula: Pb13CuSb7S24
Reflected/transmitted colour: opaque, polished section white
Pleochroism: weak
Optical isotropy/anisotropy: polished section strong anisotropy, // elongation maximal, ┴ elongation minimal; light tan, brown, blue-gray, straight extinction
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section , weak, much weaker than for jamesonite, white with a yellow brownish tint to grayish white with a reddish or faint greenish tint
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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