Formula: Pb6CrCl6(O,OH)8
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Uniaxial
Optical sign: -
Refractive indices: ε = 2.059, ω = 2.125
Bireflectance/Birefringence δ: 0.066
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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