Formula: Ca3Al2F10(OH)2.H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.413, β = 1.416-1.417, γ = 1.423
Bireflectance/Birefringence δ: 0.010
2V angle: 68-80° (calculated), 74° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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