Formula: Na3K6Ti2Al2Si8O26Cl3
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 1.601, β = 1.625, γ = 1.654
Birefringence δ: 0.053
2V angle: measured: 85°, calculated: 86°
Dispersion:
Optical orientation:
Optical axial plane:
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