Formula: (Ca,Na)8Al4Si6O23(PO4,CO3,SO4,F,Cl,OH)2
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Uniaxial
Optical sign: +
Refractive indices: ω = 1.604, ε = 1.615
Bireflectance/Birefringence δ: 0.011
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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