Formula: (Mg,Mn)2(Sb,Mn)O4
Reflected/transmitted colour: RL gray
Pleochroism:
Optical isotropy/anisotropy: RL nearly isotropic
Optical sign:
Refractive indices: n = 1.92
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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