Formula: (Zn,Mg)SO4 . 4H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.522, β = 1.531, γ = 1.536
Bireflectance/Birefringence δ: 0.014
2V angle: 72° (calculated), 70° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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