Formula: Ca8Na3(Si,Al)96O192 . 70H2O
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: a = 1.480, b = 1.481, g = 1.487
Birefringence δ: 0.007
2V angle: 25-26°
Dispersion: r > v, strong
Optical orientation: a = c, b = a, g = b
Optical axial plane:
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