Formula: 2Ca2(SiO4).CaCO3
Reflected/transmitted colour: colourless
Pleochroism:
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: α = 1.637-1.641, β = 1.672-1.676, γ = 1.767-1.681
Birefringence δ: 0.039-0.040
2Vα angle: 35-41°
Dispersion: r > v, weak
Optical orientation: α = y, β Λ x = ~33°, γ Λ z = 22°
Optical axial plane:
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