Formula: FeTiO3
Reflected/transmitted colour: opaque, polished section light to dark brown, sometimes with a faint pinkish or violet tint. Dark brown internal reflections are rare, more common in Mg-substituted ilmenite.
Pleochroism:
Optical isotropy/anisotropy: uniaxial, polished section strong anisotropic, light greenish gray, brownish gray
Optical sign: -
Refractive indices: ~ 2.7
Birefringence δ/bireflectance: polished section distinct, w light pinkish brown, ε dark brown
2V angle:
Dispersion: strong
Optical orientation:
Optical axial plane:
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