Formula: Cu4Al2(SO4)(OH)12.2-4H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: a = 1.552-1.571, b = 1.555-1.574, g = 1.565-1.576
Bireflectance/Birefringence δ: 0.005-0.013
2V angle:
Dispersion:
Optical orientation: Parallel extinction
Optical axial plane:
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