Formula: (Na, Ca, K)8(Si, Al)12O24(SO4, Cl, CO3)3.H2O
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: uniaxial
Optical sign: +
Refractive indices: w = 1.523, e = 1.529
Birefringence δ: 0.006
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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