Formula: FeFe2O4
Reflected/transmitted colour: variable, darker varieties almost opaque, polished section gray, commonly with a brownish tint, substitution by Ti may cause a brownish pink tint, Mn a more yellowish green tint, Al and Mg a yellowish tint and Cr a darker gray tint
Pleochroism: -
Optical isotropy/anisotropy: isotropic, polished section isotropic, a slight anomalous anisotropy due to internal tension by zoning or deformation may be present, distinct anisotropy caused by twinning has been reported
Optical sign:
Refractive indices: n = 2.42
Birefringence δ/bireflectance:
2V angle:
Dispersion: moderate
Optical orientation:
Optical axial plane:
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