Formula: CaMn2(AsO4)2(OH)3
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.785, β = 1.814, γ = 1.854
Bireflectance/Birefringence δ: 0.069
2V angle: 84 (calculated), ~85 (measured)
Dispersion: Weak, r < v
Optical orientation:
Optical axial plane:
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