Formula: Fe2Mo3O8
Reflected/transmitted colour: Gray with an olive tint (RL)
Pleochroism:
Optical isotropy/anisotropy: Uniaxial (TL), Strong, light brownish gray to dark greenish gray (RL)
Optical sign: -
Refractive indices:
Bireflectance/Birefringence δ: Strong, gray to olive-gray (RL)
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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