Formula: Zn6Al6(SO4)2(OH)26 .5H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Uniaxial
Optical sign: -
Refractive indices: ε = 1.514, ω = 1.534
Bireflectance/Birefringence δ: 0.020
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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