Formula: CaB2(OH)8
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: ?
Refractive indices: α = 1.563, β = 1.572, γ = 1.586
Bireflectance/Birefringence δ: 0.023
2V angle: 80° (calculated), 70° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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