Formula: Na16[Si4O6(OH)5]2[Si8O15(OH)6](OH)10.28H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.469, β = 1.482, γ = 1.490
Bireflectance/Birefringence δ: 0.021
2V angle: 74° (calculated), 75° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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