Formula: β-Ca2SiO4
Reflected/transmitted colour: Colourless
Pleochroism:
Optical isotropy/anisotropy: Biaxial
Optical sign: +
Refractive indices: α = 1.700-1.715, β = 1.715-1.723, γ = 1.725-1.740
Birefringence δ: 0.023-0.025
2Vγ angle: 60-63°
Dispersion: r < v, weak
Optical orientation: α Λ z = 13-14°, γ = y
Optical axial plane:
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