Formula: CaB2O2(OH)4
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.585, β = 1.614, γ = 1.614
Bireflectance/Birefringence δ: 0.029
2V angle: 0° (calculated), 24-28° (measured)
Dispersion:
Optical orientation: Parallel extinction
Optical axial plane:
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