Formula: CaBe3(PO4)2(OH)2.4H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.52, β = 1.52, γ = 1.53
Bireflectance/Birefringence δ: 0.01
2V angle: 0° (calculated), 5-8° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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