Formula: Ca2B14O23 . 8H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.517, β = 1.524, γ = 1.577
Bireflectance/Birefringence δ: 0.060
2V angle: 42.2° (calculated), 42° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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