Formula: ZrSiO4
Reflected/transmitted colour: colourless to pale brown
Pleochroism: very weak, in thick sections may show absorption w < ε
Optical isotropy/anisotropy: uniaxial
Optical sign: +
Refractive indices: w = 1.922-1.960, ε = 1.961-2.015 (relative fresh material, metamict material may have values outside these ranges)
Birefringence δ: 0.042-0.065 (relative fresh material, metamict material may have values outside these ranges)
2V angle: -
Dispersion: very strong
Optical orientation:
Optical axial plane:
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