Formula: Zn2(PO4)(OH)
Reflected/transmitted colour: Colourless
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.66, β = 1.705, γ = 1.713
Bireflectance/Birefringence δ: 0.053
2V angle: 44° (calculated), 50° (measured)
Dispersion: Strong
Optical orientation: X (7°,58°), Y (159°,25°), Z(-86°,80°) [using (f,r)]
Optical axial plane:
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