Formula: BaFe2Si2O7
Reflected/transmitted colour: pale green
Pleochroism: a = pale bluish green, b = g = colourless with faint brownish tint
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: a = 1.740, b = 1.740, g = 1.760
Birefringence δ: 0.02
2V angle: 0-80°
Dispersion: very strong
Optical orientation: g = b, a Ù c = 2° at 670 nm to 61° at 470 nm
Optical axial plane:
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