Formula: Bi(Fe,Al)3(PO4)2(OH)6
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Uniaxial
Optical sign: -
Refractive indices: ε = 1.81, ω = 1.82-1.83
Bireflectance/Birefringence δ: 0.01-0.02
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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