Formula: Na4(Ce,La,Nd,Sr)2(CO3)5
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +/-
Refractive indices: α = 1.623, β = 1.636, γ = 1.649
Bireflectance/Birefringence δ: 0.026
2V angle: 88° (calculated), 89-90° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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