Formula: (Na,H3O)15(Ca,Mn,REE)6Fe2Zr3([],Zr)([],Si)Si24O66(O,OH)6Cl·nH2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Uniaxial
Optical sign: +
Refractive indices: ω = 1.612, ε = 1.615
Bireflectance/Birefringence δ: 0.003
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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