Formula: (Na,Ca,K)9(Si,Al)12O24{(OH)2,SO4,CO3,Cl2]3.nH2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Uniaxial
Optical sign: -
Refractive indices: ε = 1.486, ω = 1.505
Bireflectance/Birefringence δ: 0.019
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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