Formula: Pb4Zn2(SiO4)(Si2O7)(SO4)
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: + (probable)
Refractive indices: α = 1.899, β = 1.901, γ = 1.903
Bireflectance/Birefringence δ: 0.004
2V angle: 88° (calculated), 90° (measured)
Dispersion: Strong, r < v
Optical orientation: α = b, γ ≈ a
Optical axial plane:
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