Formula: AgCuS
Reflected/transmitted colour: opaque, polished section gray with a violet-pinkish tint
Pleochroism: weak in air, strong in oil, grayish brown to whitish gray, with a faint bluish gray tinge or creamy with a pink tint
Optical isotropy/anisotropy: polished section strong; light violet, purple, brown, orange and yellow
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section weak but distinct (in oil); gray-brown to light gray with a slight bluish green or pinkish tint
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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