Formula: WS2
Reflected/transmitted colour: opaque, polished section colour similar to molybdenite, the decrease in reflectance in oil is not as strong as for molybdenite, pure white to dull gray with a bluish tint
Pleochroism: strong, in striking colours including pink and deep blue
Optical isotropy/anisotropy: polished section similar to molybdenite, very strong anisotropy
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section, similar to molybdenite, extremely strong
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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