Formula: Ca3(Si2O7)
Reflected/transmitted colour: colourless
Pleochroism: -
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 1.640-1.643, β = 1.643-1.646, γ = 1.650-1.652
Birefringence δ: 0.008-0.010
2Vγ angle: 62-69°
Dispersion: r > v
Optical orientation: α Λ x = 15°, β = y
Optical axial plane:
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