Formula: CaMn(AsO3OH)2 . 2H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: + (probable)
Refractive indices: α = 1.618, β = 1.627, γ = 1.642
Bireflectance/Birefringence δ: 0.024
2V angle: large
Dispersion: r > v
Optical orientation:
Optical axial plane:
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