Formula: CuAl4(SO4)(OH)12 . 3H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.52, β = 1.52, γ = 1.53
Bireflectance/Birefringence δ: 0.01
2V angle: 0° (calculated), 0-15° (measured)
Dispersion: Relatively strong
Optical orientation:
Optical axial plane:
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