Formula: Ca2B5O9(OH).H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.637, β = 1.650, γ = 1.670
Bireflectance/Birefringence δ: 0.033
2V angle: 80° (calculated), 46° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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