Formula: Cu3TeO4(OH)4
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: α = 1.775, β = 1.900, γ = 1.920
Bireflectance/Birefringence δ: 0.145
2V angle: measured: 41° , calculated: 40°
Dispersion:
Optical orientation:
Optical axial plane:
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