Formula: Ca16(Mg,Li)2[B13O17(OH)12]4Cl6·28H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.516, β = 1.532, γ = 1.554
Bireflectance/Birefringence δ: 0.038
2V angle: 82° (calculated), 82.2° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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