Formula: Ca3(Zr,Ti)Si2O9
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: a = 1.652, b = 1.658, g = 1.670
Birefringence δ: 0.018
2V angle: ~72°
Dispersion:
Optical orientation: a = c, g = a
Optical axial plane:
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