Reflected/Transmitted light color: colorless

Pleochroism: absent

Optical isotropy/anisotropy: uniaxial

Optical sign: -

Refractive indices: nω = 1.679 - 1.681 nε = 1.500

Birefringence δ = 0.179 - 0.181

2V angle: 0

Dispersion: r > ν