Formula: b-FeO(OH,Cl)
Reflected/transmitted colour: light yellowish brown
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: nd
Refractive indices: nd
Bireflectance/Birefringence δ: nd
2V angle: nd
Dispersion:
Optical orientation:
Optical axial plane:
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