Formula: Na2B4O5(OH)4.3H2O
Reflected/transmitted colour: Colourless
Pleochroism:
Optical isotropy/anisotropy: Uniaxial
Optical sign: +
Refractive indices: ω = 1.46, ε = 1.47
Bireflectance/Birefringence δ: 0.01
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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