Formula: Ca3(Ti, Sn)As6Si2Be2O20
Reflected/transmitted colour: yellow to colourless
Pleochroism:
Optical isotropy/anisotropy: uniaxial, anomalously biaxial
Optical sign: -
Refractive indices: w = 1.86, e = 1.83
Birefringence δ: 0.03
2V angle: (0-17°)
Dispersion:
Optical orientation:
Optical axial plane:
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