Formula:
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.548 - 1.552, β = 1.562 - 1.564, γ = 1.570 - 1.571
Bireflectance/Birefringence δ: 0.019-0.022
2V angle: 74° (measured), 72-74° (calculated)
Dispersion:
Optical orientation:
Optical axial plane:
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