Formula: KLiMg2Si4O10F2
Reflected/transmitted colour:
Pleochroism: Colourless to pale greenish brown (X), yellowish to reddish brown (Y=Z)
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.522-1.54, β = 1.553-1.57, γ = 1.553-1.57
Bireflectance/Birefringence δ: 0.030-0.031
2V angle: 0° (calculated), 0-5° (measured)
Dispersion: r > v or r < v
Optical orientation:
Optical axial plane:
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