Formula: CuGaS2
Reflected/transmitted colour: polished section gray
Pleochroism:
Optical isotropy/anisotropy: polished section distinct anisotropic, gray-blue tints
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section in oil distinct on grain boundaries and twin lamellae, brownish gray to violet-gray
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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