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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