Formula: MnAsO3(OH) . H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.620, β = 1.639, γ = 1.686
Bireflectance/Birefringence δ: 0.066
2V angle: 68° (calculated), 65° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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