Formula: α-Fe2O3
Reflected/transmitted colour: opaque, gray-white with a slight blue tint in polished section
Pleochroism: -
Optical isotropy/anisotropy: uniaxial
Optical sign: -
Refractive indices: ε = 2.87-2.94, w = 3.15-3.22
Birefringence δ: 0.28
2V angle:
Dispersion: very strong
Optical orientation:
Optical axial plane:
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