Formula: (Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3 . 18H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.532, β = 1.532, γ = 1.532
Bireflectance/Birefringence δ: 0.000
2V angle: 0° (calculated), 83° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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