Formula: (Ca,Na)0.3(Li,Mg)2(Si,Al)4O10(OH,F)2.nH2O
Reflected/transmitted colour:
Pleochroism: Colourless (y), light yellowish brown (z)
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.492, β = 1.524, γ = 1.526
Bireflectance/Birefringence δ: 0.034
2V angle: 26.2° (calculated), 29-45° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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