Formula: BaMg2LiAl3Si4O12(OH,F)8
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: a = 1.5807-1.5810, b = 1.5954-1.5958, g = 1.5984-1.6008
Birefringence δ: 0.12
2V angle: 68-72°
Dispersion:
Optical orientation: a = b, b = c, g = a
Optical axial plane:
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