Formula: Na5(CO3)(HCO3)3
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.433, β = 1.519, γ = 1.528
Bireflectance/Birefringence δ: 0.095
2V angle: 34° (calculated), 32.4° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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