Formula: Na4(Al3Si9O24)Cl
Reflected/transmitted colour: colourless
Pleochroism: -
Optical isotropy/anisotropy: uniaxial
Optical sign: -
Refractive indices: ε = 1.531-1.541, w = 1.539-1.550
Birefringence δ: 0.004-0.005
2V angle:
Dispersion: moderate
Optical orientation:
Optical axial plane:
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