Formula: MgTiO3
Reflected/transmitted colour: brownish to purplish red, polished section somewhat darker brown than for ilmenite, orange-red internal reflections are more frequently present than for ilmenite.
Pleochroism: moderate to weak, O pinkish red, E brownish to purplish red
Optical isotropy/anisotropy: uniaxial, polished section strong anisotropic, colours more vivid than for ilmenite
Optical sign: -
Refractive indices: O = 2.31-2.35, E = 1.95-1.98
Birefringence δ/bireflectance: ~ 0.40-0.48, polished section distinct
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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