Formula: NaAlSi2O6.H2O
Reflected/transmitted colour: colourless
Pleochroism: -
Optical isotropy/anisotropy: isotropic
Optical sign:
Refractive indices: n = 1.479-1.493
Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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