Formula: (K,Na)5(Ba,Ca)2Si23Al9O64 . 23H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.499, β = 1.500, γ = 1.501
Bireflectance/Birefringence δ: 0.002
2V angle: 88° (calculated), 56° (measured)
Dispersion: r > v
Optical orientation:
Optical axial plane:
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