Formula: SiO2
Reflected/transmitted colour: colourless
Pleochroism: -
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 1.469-1.479, β = 1.470-1.480, γ = 1.473-1.483
Birefringence δ: 0.0025-0.004
2Vγ angle: 40-90°
Dispersion:
Optical orientation: α = y
Optical axial plane: (100)
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