Formula: BaBe2Si2O7
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: -/+
Refractive indices: a = 1.695, b = 1.702, g = 1.708
Birefringence δ: 0.013
2V angle: 60-70°
Dispersion: r > v
Optical orientation: a = b, b = c, g = a
Optical axial plane:
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