Formula: AlF(OH)2
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.532, β = 1.552, γ = 1.567
Bireflectance/Birefringence δ: 0.035
2V angle: 80° (calculated), 80° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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