Formula: CaB2O2(OH)4
Reflected/transmitted colour: Colourless
Pleochroism:
Optical isotropy/anisotropy: Biaxial, anomalous dark blue and brown interference colours may be observed
Optical sign: +
Refractive indices: α = 1.604, β = 1.609, γ = 1.615
Bireflectance/Birefringence δ: 0.011
2V angle: 86° (calculated), 85° (measured)
Dispersion: Strong, r > v
Optical orientation:
Optical axial plane:
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