Formula: (Cu,Ca,Fe)10Bi(AsO4)4(OH)11·2H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Uniaxial
Optical sign: -
Refractive indices: ε = 1.705, ω = 1.785
Bireflectance/Birefringence δ: .080
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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