Formula: (Mg,Cu)Al(SO4)2Cl . 14H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.466, β = 1.481, γ = 1.4875
Bireflectance/Birefringence δ: 0.0215
2V angle: 66° (calculated), 112-114° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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