Formula: CuO
Reflected/transmitted colour: opaque, transparent only in the thinnest scales, brown, polished section in air grayish white with golden tint, in oil much darker
Pleochroism: polished section strong pleochroism in oil, creamy gray to dull brownish gray
Optical isotropy/anisotropy: polished section strong anisotropic, blue to light creamy gray, extinction not complete and oblique
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: see colour
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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