Formula: Ca2B2O5·(H2O)
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.556, β = 1.593, γ = 1.663
Bireflectance/Birefringence δ: 0.107
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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