Formula: Ca(Mg,Mn,Fe)B2O5
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.635, β = 1.681, γ = 1.698
Bireflectance/Birefringence δ: 0.036
2V angle: 60 (calculated), 6 (measured)
Dispersion: r > v
Optical orientation:
Optical axial plane:
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