Formula: Bi2Fe(Co,Fe)(AsO4)2(O,OH)2(OH)2
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 2.02, β = 2.09, γ = 2.12
Bireflectance/Birefringence δ: 0.10
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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