Formula: Ta2O5
Reflected/transmitted colour: Colourless, RL grayish white
Pleochroism:
Optical isotropy/anisotropy: Biaxial, RL observed
Optical sign: ?
Refractive indices:
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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