Formula: Bi(Nb,Ta)O4
Reflected/transmitted colour: Brown
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 2.38, β = 2.42, γ = 2.47
Bireflectance/Birefringence δ: 0.09
2V angle: 86° (calculated), 85° (measured)
Dispersion:
Optical orientation: X = a, Y = c, Z = b
Optical axial plane:
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