Formula: K2Na2Al4Si4O16 . 5H2O
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: a = 1.485, b = 1.490, g = 1.494
Birefringence δ: 0.01
2V angle: 82°
Dispersion:
Optical orientation: a = b, g Ù c = 12°
Optical axial plane:
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