Formula: (Zn,Cu,Fe)SO4 .7H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.477-1.479, β = 1.483-1.487, γ = 1.488-1.489
Bireflectance/Birefringence δ: 0.010-0.011
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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