Formula: Zn8Cu4(TeO3)3(OH)18
Reflected/transmitted colour: Green
Pleochroism: Blue green (O), almost colourless (E)
Optical isotropy/anisotropy: Uniaxial
Optical sign: -
Refractive indices: ε = 1.740, ω = 1.802
Bireflectance/Birefringence δ: 0.062
2V angle:
Dispersion:
Optical orientation: Parallel extinction, length fast
Optical axial plane:
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