Zincospiroffite

Formula: Zn2(Te3O8)

Reflected/transmitted colour: RL Gray wih no internal reflections

Pleochroism: Weak

Optical isotropy/anisotropy: Weak, n (calculated) = 2.06 from Gladstone-Dale relationship

Optical sign:

Refractive indices:

Bireflectance/Birefringence δ: Weak

2V angle:

Dispersion:

Optical orientation:

Optical axial plane:

 

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