Formula: NaCaB5O6(OH)6.5H2O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: a=1.49, b=1.51, g=1.52
Bireflectance/Birefringence δ: 0.03
2V angle: 68 (calculated), 73-78 (measured)
Dispersion:
Optical orientation: X (11.5°,81°), Y (100°, 21.5°), Z (107°, 70°) [with c (0°,0°) and b* (0°,90°) using (f, r)]
Optical axial plane:
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