Formula: (Zn,Mn)Mn3O7.1-2H2O
Reflected/transmitted colour: RL light gray to yellowish gray
Pleochroism:
Optical isotropy/anisotropy: Uniaxial, RL strong
Optical sign:
Refractive indices:
Bireflectance/Birefringence δ: RL weak
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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