Tazheranite

Formula: (Zr,Ti,Ca)O2

Reflected/transmitted colour: Pale yellow, zoned with a reddish tint

Pleochroism:

Optical isotropy/anisotropy: Isotropic, may exhibit weak to strong anistropism, centrally zoned

Optical sign:

Refractive indices: n = 2.25

Bireflectance/Birefringence δ:

2V angle:

Dispersion:

Optical orientation:

Optical axial plane:

 

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