Formula: (Na,Ca,K)8Al6Si6O24(Cl,SO4,CO3)2-3
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Uniaxial
Optical sign: +
Refractive indices: ω = 1.518-1.522, ε = 1.517-1.527
Bireflectance/Birefringence δ: 0.000-0.005
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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