Formula: Na4ZrSi6O15(OH)2.H2O
Reflected/transmitted colour: Nearly colourless
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: =1.576, b=1.582, g=1.584
Bireflectance/Birefringence δ: 0.008
2V angle: 53 (measured)
Dispersion: Weak, r > v
Optical orientation:
Optical axial plane:
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