Formula: KCaAl3Si3O12.5H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.505, β = 1.511, γ = 1.517
Bireflectance/Birefringence δ: 0.012
2V angle: 88° (calculated), 87° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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