Formula: FeNb3S6
Reflected/transmitted colour: Similar to molybdenite
Pleochroism: Distinct, from gray to light gray with a bluish tint
Optical isotropy/anisotropy: Strong from almost white to dark brown
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ: Distinct
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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