Formula: MgFe2O4
Reflected/transmitted colour: variable, darker varieties almost opaque, polished section in air gray with a brownish tint, in oil distinctly brown
Pleochroism: -
Optical isotropy/anisotropy: isotropic, polished section isotropic
Optical sign:
Refractive indices: n = 2.38
Birefringence δ/bireflectance:
2V angle:
Dispersion: moderate
Optical orientation:
Optical axial plane:
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