Formula: (Cu,Zn)16(TeO3)(TeO4)2Cl(OH)25.27H2O
Reflected/transmitted colour:
Pleochroism: Green (X), bluish green (Y=Z)
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.758, β = 1.796, γ = 1.810
Bireflectance/Birefringence δ: 0.052
2V angle: 61° (calculated), 64° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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