Formula: (Mg,Ti,Fe,Al)2(BO3)O
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.806, β = 1.809, γ = 1.830
Bireflectance/Birefringence δ: 0.024
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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