Formula: Fe(SO4)Cl.6H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: α = 1.536, β = 1.570, γ = 1.628
Bireflectance/Birefringence δ: 0.092
2V angle: measured: 77° , calculated: 78°
Dispersion:
Optical orientation:
Optical axial plane:
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