Formula: (Zn, Fe)2 (Te O3)3 Nax H2-x
Reflected/transmitted colour:
Pleochroism: Reddish brown (ε), yellowish brown (ω)
Optical isotropy/anisotropy: Uniaxial
Optical sign: +
Refractive indices: ω = 1.85, ε = 1.93
Bireflectance/Birefringence δ: 0.08
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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