Formula: Ca2Mn3(AsO4)2O2CO3·3H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.757, β = 1.800, γ = 1.800
Bireflectance/Birefringence δ: 0.043
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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