Formula: Ca6Cu3(SO4)3(OH)12.2H2O
Reflected/transmitted colour:
Pleochroism: Strong, pale blue (X), grayish blue (Y), dark blue (Z)
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.590, β = 1.610, γ = 1.619
Bireflectance/Birefringence δ: 0.029
2V angle: 66° (calculated), 65-67° (measured)
Dispersion: Moderate, r > v
Optical orientation: X = b, Z Ù c = -11.5°
Optical axial plane:
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