Formula: CuAsS
Reflected/transmitted colour: opaque, polished section grayish white with a brownish pink tint (in oil), very weak internal reflections sometimes visible
Pleochroism: polished section very weak
Optical isotropy/anisotropy: polished section distinct anisotropy, much weaker than for enargite, bluish green or bluish violet to violet-brown
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section weak, only visible in oil on grain boundaries, brownish pink to somewhat more bluish
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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