Formula: CaCO3
Reflected/transmitted colour: colourless
Pleochroism: -
Optical isotropy/anisotropy: biaxial
Optical sign: -
Refractive indices: α = 1.530-1.531, β = 1.680-1.681, γ = 1.685-1.686
Birefringence δ: 0.155-0.156
2Vα angle: 18-18.5°
Dispersion: r < v, weak
Optical orientation: α = z, β = x, γ = y
Optical axial plane: (100)
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