Formula: Na2Ca(PO4)F
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.508, β = 1.515, γ = 1.52
Bireflectance/Birefringence δ: 0.012
2V angle: 80° (calculated), 80° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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