Formula: (Fe,Mn)2(PO4)F
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.686, β = 1.69, γ = 1.703
Bireflectance/Birefringence δ: 0.017
2V angle: 60° (calculated), 58° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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