Formula: (Mn,Fe)(V,Cr)2O4
Reflected/transmitted colour: RL brownish gray
Pleochroism:
Optical isotropy/anisotropy: Isotropic
Optical sign: n (calculated) = 2.18 and 2.23 from Gladstone-Dale relationship
Refractive indices:
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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