Formula: KFe(SO4)2
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.593, β = 1.684, γ = 1.698
Bireflectance/Birefringence δ: 0.105
2V angle: 40° (calculated), 30° (measured)
Dispersion: Strong r > v
Optical orientation:
Optical axial plane:
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