Formula: (Na,Ca)13Sr11(Zr,Y,Nb)14[(Si3O9)10|(H2BSi2O9)6] · 12H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Uniaxial
Optical sign: +
Refractive indices: ω = 1.627, ε = 1.645
Bireflectance/Birefringence δ: 0.018
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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