Formula: LiAlSi4O10
Reflected/transmitted colour: colourless
Pleochroism: -
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 1.504-1.507, β = 1.510-1.513, γ = 1.516-1.523
Birefringence δ: 0.011-0.017
2Vγ angle: 82-84°
Dispersion: r > v
Optical orientation: α Λ x = 2-8°, β Λ z = 24-30°, γ = y
Optical axial plane: ┴ (010)
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