Formula: (Co,Zn,Ni)6(SO4)(OH,Cl)10.8H2O
Reflected/transmitted colour:
Pleochroism: Strong, pink (O), pale pink (E)
Optical isotropy/anisotropy: Uniaxial
Optical sign: -
Refractive indices: ε = 1.542, ω = 1.568
Bireflectance/Birefringence δ: 0.026
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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