Formula: Ca2Zn(AsO4)2.2H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.703, β = 1.71, γ = 1.720
Bireflectance/Birefringence δ: 0.017
2V angle: 80-82° (calculated), 50-57° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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