Formula: Na19(Ca,Mn)6(Ti,Nb)3Si26O74Cl.2H2O
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: uniaxial
Optical sign: +
Refractive indices: w = 1.618, e = 1.626
Birefringence δ: 0.008
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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