Formula: Ca9Si12O30(OH)6.4H2O
Reflected/transmitted colour: Colourless
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.570, β = 1.571, γ = 1.575
Bireflectance/Birefringence δ: 0.005
2V angle: n.d.
Dispersion: Weak
Optical orientation: X = c, Y = b, Z = a
Optical axial plane:
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