Formula: MoS2
Reflected/transmitted colour: nearly opaque, translucent in very thin flakes, very pale yellow to deep reddish brown, polished section white to dull gray with a bluish tint
Pleochroism: very strong
Optical isotropy/anisotropy: polished section very strong anisotropic, 45° white with pinkish tint, nicols not completely crossed, dark blue, very characteristic
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section extremely strong and characteristic, O white, E dull gray with bluish tint
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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