Formula: Ca3Ti5[Si6O17)2O(OH)4] 14H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.705, β = 1.627, γ = 1.612
Bireflectance/Birefringence δ: 0.093
2V angle: 31° (calculated), 35-45° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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