Formula: Ca4B10O19.7H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.571-1.573, β = 1.59-1.591, γ = 1.593-1.594
Bireflectance/Birefringence δ: 0.021-0.022
2V angle: 42-44° (calculated), 32-44° (measured)
Dispersion: Strong, r < v
Optical orientation:
Optical axial plane:
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