Formula: (Ca,Cu)Al6(PO4)4(OH)8 . 4-5H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.580, β = 1.599, γ = 1.605
Bireflectance/Birefringence δ: 0.025
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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