Formula: Na12Sr3Ca6Fe3Zr3NbSi25O73(O,OH,H2O)3Cl2
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Uniaxial
Optical sign: -
Refractive indices: ε = 1.638, ω = 1.649
Bireflectance/Birefringence δ: 0.011
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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