Formula: KCa2AlSi7O17(OH)2 . 6H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: ?
Refractive indices: α = 1.503, γ = 1.518
Bireflectance/Birefringence δ: 0.015
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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