Formula: NaAl(AsO4)F
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.634, β = 1.673, γ = 1.685
Bireflectance/Birefringence δ: 0.051
2V angle: 56 (calculated), 45 (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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