Formula: Ca12Al2Si18O51.18H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.518-1.525, γ = 1.530-1.537
Bireflectance/Birefringence δ: 0.012
2V angle:
Dispersion: Relatively strong
Optical orientation:
Optical axial plane:
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