Formula: Ca3(Si2O7).2CaCO3
Reflected/transmitted colour: colourless
Pleochroism: -
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 1.605-1.617, β = 1.626-1.635, γ = 1.651-1.654
Birefringence δ: 0.035-0.046
2Vγ angle: 85-89°
Dispersion: r < v
Optical orientation: α Λ z = 24°, β = y, γ Λ{20-1} cleavage plane = ~12°
Optical axial plane:
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