Formula: K2Fe5Fe4(SO4)12.18H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Isotropic, but typically sectored with anomalously biaxial parts
Optical sign:
Refractive indices: n = 1.593-1.608
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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