Formula: Cu3Al4(PO4)3 (OH)9 .4H2O
Reflected/transmitted colour:
Pleochroism: Weak blue (ε), weak blue (ω)
Optical isotropy/anisotropy: Uniaxial
Optical sign: -
Refractive indices: ε = 1.635, ω = 1.646
Bireflectance/Birefringence δ: 0.011
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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