Formula: KCa4[B5O8(OH)]4[B(OH)3]2Cl.4H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.523-1.536, β = 1.53-1.539, γ = 1.596-1.603
Bireflectance/Birefringence δ: 0.067-0.073
2V angle: 26-38° (calculated), 24-37° (measured)
Dispersion:
Optical orientation: Y = b, Z Ù a = 31°
Optical axial plane:
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