Formula:
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.676, β = 1.695, γ = 1.698
Bireflectance/Birefringence δ: 0.022
2V angle: 42.2° (calculated), 43° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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