Coloradoite

Formula: HgTe

Reflected/transmitted colour: white with slightly grayish brown tint, tarnishing to dull purple

Pleochroism:

Optical isotropy/anisotropy: moderate anisotropy, dark brownish red to blue gray

Optical sign:

Refractive indices:

Bireflectance/Birefringence δ: weak or absent

2V angle:

Dispersion:

Optical orientation:

Optical axial plane:

 

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