Zorite

Formula: Na2Ti(Si,Al)3O9.nH2O

Reflected/transmitted colour:

Pleochroism:

Optical isotropy/anisotropy: Biaxial

Optical sign: ?

Refractive indices: n (calculated) = 1.59 and n (calculated) = 1.64 from Gladstone-Dale relationship

Bireflectance/Birefringence δ:

2V angle:

Dispersion:

Optical orientation:

Optical axial plane:

 

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