Formula: BaCa2Si3O9
Reflected/transmitted colour:
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: -
Refractive indices: α = 1.668, β = 1.684, γ = 1.685
Bireflectance/Birefringence δ: 0.017
2V angle: 26° (calculated), 30° (measured)
Dispersion: Weak
Optical orientation:
Optical axial plane:
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