Formula: Mg3(AsO4)2 . 8H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.563, β = 1.571, γ = 1.596
Bireflectance/Birefringence δ: 0.033
2V angle: 60° (calculated), 60° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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