Formula: FeFe2(PO4)2(OH)2.4H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.676, β = 1.725, γ = 1.745
Bireflectance/Birefringence δ: 0.069
2V angle: 62° (calculated), 60-65° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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