TC380AG: Doubly terminated, thick crystal of the Dissakisite-(Ce)/Allanite-(Ce) isomorphous series. 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 Talc crystals and white rhombohedral Dolomite crystals.
Trimouns Mine, Luzenac, Haute-Ariège, Foix, Ariège Department, Occitanie  France

Specimen size: 4.8 × 4.2 × 4.1 cm = 1.89” × 1.65” × 1.61”

Main crystal size: 1.4 × 0.2 cm = 0.55” × 0.08”