Formula: (Ce,La,TH)PO4
Reflected/transmitted colour: yellow or colourless
Pleochroism: very weak, light yellow to very light yellow
Optical isotropy/anisotropy: biaxial
Optical sign: +
Refractive indices: α = 1.774-1.800, β = 1.777-1.801, γ = 1.828-1.851
Birefringence δ: 0.045-0.075
2Vγ angle: 6-19°
Dispersion: usually r < v, weak
Optical orientation: α = y, β Λ x = 7-12°, γ Λ z = 2-7°
Optical axial plane: ┴ (010)
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