Tongbaite

Formula: Cr3C2

Reflected/transmitted colour: Pale violet (RL)

Pleochroism: Distinct (RL)

Optical isotropy/anisotropy: Biaxial; Strong anisotropic, purplish yellow to yellow orange (RL)

Optical sign:

Refractive indices:

Bireflectance/Birefringence δ: Distinct (RL)

2V angle:

Dispersion:

Optical orientation:

Optical axial plane:

 

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