Formula: Ba3(Nb,Ti)6(Si2O7)2O12
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: uniaxial
Optical sign: +
Refractive indices: w = 1.928, e = 2.002
Birefringence δ: 0.074
2V angle: 0-10° (anomalous)
Dispersion:
Optical orientation:
Optical axial plane:
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