Formula: (Cu,Ag)21As10
Reflected/transmitted colour: opaque, polished section light cream
Pleochroism:
Optical isotropy/anisotropy: polished section medium anisotropy, dar-blue-gray and lighter brown-ocher colour effects in marginal positions
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section bireflectance not observed
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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