Group of crystals of the isomorphous series Dissakisite-(Ce)/Allanite-(Ce). 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. This specimen has been published on the Mineralogical Record web page, in the ‘What's New’ section, report 59, March 7, 2021 edition, page 6
Trimouns Mine, Luzenac, Haute-Ariège, Foix, Ariège Department, Occitanie France
Specimen size: 4.2 × 3.6 × 3.4 cm = 1.65” × 1.42” × 1.34”
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