Formula: Na5CaTi5Si12O34(OH)8·5H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.599, β = 1.61, γ = 1.696
Bireflectance/Birefringence δ: 0.097
2V angle: 42° (calculated), 38-41° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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