Formula: Ca2Be4(PO4)3(OH)3.5H2O
Reflected/transmitted colour: Colourless
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.51-1.512, β = 1.525-1.526, γ = 1.533-1.536
Bireflectance/Birefringence δ: 0.023-0.024
2V angle: 70° (calculated), 66° (measured)
Dispersion:
Optical orientation: X = b, Z Ù a = 9-20°
Optical axial plane:
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