Formula: BaCu3(VO4)2(OH)2
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 2.053, β = 2.129, γ = 2.133
Bireflectance/Birefringence δ: 0.080
2V angle: 24° (calculated), 60° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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