Formula: Zn1-xAlx(SO4)x/2(OH)2.nH2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Uniaxial
Optical sign: ?
Refractive indices: b = 1.532-1.558
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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