Formula: Ca5Si6(O,OH)18 . 5H2O
Reflected/transmitted colour: Colourless
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +/-
Refractive indices: α = 1.575, β = 1.580, γ = 1.585
Bireflectance/Birefringence δ: 0.010
2V angle: 88° (calculated), 89.8° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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