Formula: NaCa2Al2(PO4)2(F,OH)5 .2H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.551, β = 1.563, γ = 1.565
Bireflectance/Birefringence δ: 0.014
2V angle: 44° (calculated), 43° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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