Formula: (V,Fe)O(OH)
Reflected/transmitted colour: opaque, polished section white to gray
Pleochroism:
Optical isotropy/anisotropy: biaxial, polished section strong anisotropic, bright grayish yellow to dark brown
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section weak
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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