Formula: CaLiAl2(AlBeSi2)O10(OH)2
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: a = 1.651, b = 1.659, g = 1.661
Birefringence δ: 0.01
2V angle: 35-52°
Dispersion:
Optical orientation: a ≈ c, b = a, g = b
Optical axial plane:
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