Formula: Ca5H2(AsO4)4.5H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.65, β = 1.654-1.656, γ = 1.661
Bireflectance/Birefringence δ: 0.011
2V angle: 76-84° (calculated), 70° (measured)
Dispersion: Strong, r > v
Optical orientation: Z Ù c = 37°
Optical axial plane:
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