Formula: FeSb2O4
Reflected/transmitted colour:
Pleochroism: Brownish yellow (E), straw-yellow (O)
Optical isotropy/anisotropy: Uniaxial
Optical sign: +
Refractive indices: Weak, ω > 1.74
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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