Formula: (Na,Ca)4-8(Al6Si6O24)(SO4,S)1-2
Reflected/transmitted colour: colourless or pale blue
Pleochroism: -
Optical isotropy/anisotropy: isotropic
Optical sign:
Refractive indices: n = 1.496-1.508
Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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