Formula: (V,Fe)4Ti3AsO13(OH)
Reflected/transmitted colour: Gray (RL)
Pleochroism:
Optical isotropy/anisotropy: Moderate anisotropic, yellowish gray to dark gray (RL), biaxial (TL)
Optical sign: ?
Refractive indices:
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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