Formula: Cu6As
Reflected/transmitted colour: opaque, polished section yellowish to greenish gray, tarnishes dull on exposure
Pleochroism:
Optical isotropy/anisotropy: polished section strongly anisotropic, without colour effects
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section distinct
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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