Formula: CuS
Reflected/transmitted colour: opaque, polished section: basal section indigo blue, cross section show extreme high bireflectance both in air and oil
Pleochroism:
Optical isotropy/anisotropy: uniaxial; polished section extremely strong anisotropy; 45° fiery orange, reddish brown
Optical sign: +
Refractive indices: w = 1.45, ε = 2.62
Birefringence δ/bireflectance: ~ 1.17, polished section extraordinary high, most characteristic feature, in air w deep blue with violet tint, ε bluish white, in oil O purple to violet-red, scratches may appear as orange-red ligth lines
2V angle:
Dispersion: strong
Optical orientation: ε//z, w ┴ z
Optical axial plane:
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