Formula: (Na,Ca,K)8(Al6Si6O24)(SO4)2Cl.H2O
Reflected/transmitted colour: Colourless
Pleochroism: Colourless (O), yellow-green (E)
Optical isotropy/anisotropy: Uniaxial
Optical sign: +
Refractive indices: ω = 1.528, ε = 1.543
Bireflectance/Birefringence δ: 0.015
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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