Formula: BaTiSi3O9
Reflected/transmitted colour: colourless to purplish blue
Pleochroism: w = colourless, e = purple, indigo, greenish blue
Optical isotropy/anisotropy: uniaxial
Optical sign: +
Refractive indices: w = 1.756-1.757, e = 1.802-1.804
Birefringence δ: 0.045-0.048
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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