Formula: (Fe,Mn)Sn(OH)6
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Uniaxial
Optical sign: -
Refractive indices: ω = 1.837, ε = 1.833
Bireflectance/Birefringence δ: 0.004
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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