Formula: CaAl3(PO4)(SO4)(OH)6
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Uniaxial, may exhibit anomalous biaxial sectors
Optical sign: +
Refractive indices: ω = 1.636, ε = 1.647
Bireflectance/Birefringence δ: 0.011
2V angle: 0-20° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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