Formula: Fe4Fe8Sb12O32S2
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Uniaxial
Optical sign: ?
Refractive indices: n (calculated) = 2.09 and 2.11 from Gladstone-Dale relationship
Bireflectance/Birefringence δ:
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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