Formula: (Fe,Mn,Ca)SiO3
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.746-1.756, β = 1.75-1.758, γ = 1.764-1.768
Bireflectance/Birefringence δ: 0.012-0.018
2V angle: 50-58° (calculated), 30-40° (measured)
Dispersion:
Optical orientation:
Optical axial plane:
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