Tolbachite

Formula: CuCl2

Reflected/transmitted colour:

Pleochroism: Pale greenish perpendicular to elongation, dark reddish brown parallel to elongation

Optical isotropy/anisotropy: Biaxial

Optical sign: n.d.

Refractive indices: n.d.

Bireflectance/Birefringence δ: High

2V angle: n.d.

Dispersion:

Optical orientation: Elongation positive

Optical axial plane:

 

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