Formula: Cu4(SO4)(OH)6.2H2O
Reflected/transmitted colour: Blue
Pleochroism: Strong, pale blue (x), deep greenish blue (y), greenish blue (z)
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.637, β = 1.682, γ = 1.694
Bireflectance/Birefringence δ: 0.057
2V angle: 52° (calculated), 53° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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