Formula: (Ca,Mn,Na)2(Zr,Mn)5(Sb,Ti,Fe)2O16
Reflected/transmitted colour: Colourless to gray (reflected light)
Pleochroism:
Optical isotropy/anisotropy: Uniaxial, weak anisotropy in reflected light
Optical sign: +
Refractive indices: ω = 2.12, ε = 2.16
Bireflectance/Birefringence δ: 0.04
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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