Formula: Cu3AsO4(OH)3
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.76, β = 1.8, γ = 1.83
Bireflectance/Birefringence δ: 0.07
2V angle: 80° (calculated), 77° (measured)
Dispersion: r > v
Optical orientation:
Optical axial plane:
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