Formula: NaMg(Al,Fe)(C2O4)3 .8H2O
Reflected/transmitted colour:
Pleochroism: Reddish violet (ε), greenish yellow (ω)
Optical isotropy/anisotropy: Uniaxial
Optical sign: -
Refractive indices: ε = 1.408, ω = 1.479
Bireflectance/Birefringence δ: 0.071
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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