Formula: Zn(AsO3)(OH) . H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.632, β = 1.652, γ = 1.693
Bireflectance/Birefringence δ: 0.061
2V angle: 72° (calculated), 70° (measured)
Dispersion:
Optical orientation: X = b, Y Ù a ≈ 28°, Z Ù c ≈ 22°
Optical axial plane:
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