TC240AF: Crystal of the isomorphous series Dissakisite-(Ce)/Allanite-(Ce), transparent and lustrous. The majority of Trimouns specimens present color zoning that seems to indicate the presence of both species in the same crystal, the darkest areas corresponding to Allanite-(Ce), as they are richer in iron, and the dominant lighter areas to Dissakisite-(Ce). On matrix, with white rhombohedral Dolomite crystals.
Trimouns Mine, Luzenac, Haute-Ariège, Foix, Ariège Department, Occitanie  France

Specimen size: 6.4 × 3.8 × 4.1 cm = 2.52” × 1.50” × 1.61”

Main crystal size: 0.9 × 0.1 cm = 0.35” × 0.04”