Formula: (Cu,Zn)3(PO4)(OH)3.2H2O
Reflected/transmitted colour:
Pleochroism: Greenish blue (x), blue (z)
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.618-1.64, β = 1.622-1.658, γ = 1.658-1.695
Bireflectance/Birefringence δ: 0.040-0.055
2V angle: 38-72° (calculated), 38-71° (measured)
Dispersion: Weak to strong, r < v
Optical orientation: Y = b, Z Ù c = -35° to -43°
Optical axial plane:
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