Formula: CuSbS2
Reflected/transmitted colour: opaque, polished section white with a pinkish gray tint with rarely pale red internal reflections
Pleochroism: feeble in air, somewhat stronger in oil
Optical isotropy/anisotropy: polished section distinct anisotropic, more vivid than for bournonite, pinkish, green gray, bluish gray, Extinction // elongation
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section distinct in oil, especially in granular aggregates, creamy white to light brown, darker perpendicular to elongation
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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