Formula: Cu5Zn3(TeO4)4(OH)8 7H2O
Reflected/transmitted colour: RL pale brown with green internal reflections
Pleochroism: RL none
Optical isotropy/anisotropy: Biaxial
Optical sign: ?
Refractive indices: a=1.83-1.84, b=1.83-1.9, g=1.88-1.9
Bireflectance/Birefringence δ: 0.05-0.06, RL slight
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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