Formula: Ca(Fe,Mg)6(SiO4)2(PO4)2
Reflected/transmitted colour:
Pleochroism: Pale yellow (ε), paler yellow (ω)
Optical isotropy/anisotropy: Unixial
Optical sign: -
Refractive indices: ε = 1.759, ω = 1.77
Bireflectance/Birefringence δ: 0.011
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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