Formula: NaAl4Fe7(PO4)5(PMo12O40)(OH)16.56H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.686, β = 1.71, γ = 1.72
Bireflectance/Birefringence δ: 0.034
2V angle: 64° (calculated), 55° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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