Formula: K2ZrSi3O9.H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.596, β = 1.619, γ = 1.630
Bireflectance/Birefringence δ: 0.034
2V angle: 68° (calculated), 80° (measured)
Dispersion:
Optical orientation: X = c, Y = b, Z = a
Optical axial plane:
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