Formula: SrAlF4(OH).H2O
Reflected/transmitted colour: Colourless
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.452, β = 1.456, γ = 1.458
Bireflectance/Birefringence δ: 0.006
2V angle: 70° (calculated), 70° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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