Formula: Bi2PO4OOH
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 2.05, β = 2.06, γ = 2.09
Bireflectance/Birefringence δ: 0.04
2V angle: 62° (calculated), 58-61° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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