Formula: Ca3(AsO4)2.10H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.540-1.546, β = 1.552, γ = 1.570-1.576
Bireflectance/Birefringence δ: 0.030
2V angle: 80° (calculated), 85° (measured)
Dispersion:
Optical orientation: Y Ù c = 5-10°
Optical axial plane:
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