Formula: BaNa2Al4Si4O16
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: a = 1.5695, b = 1.5710, g = 1.5775
Birefringence δ: 0.08
2V angle: 52° (calculated), 41° (measured)
Dispersion:
Optical orientation: a = c, b = a, g = b
Optical axial plane:
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