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Allanite-(Ce) - Trimouns Talc Mine, Luzenac, Ariège, Midi-Pyrénées, France (#:MINS9039)

A well shaped 9 mm crystal of this REE , perched in contrasting matrix from this classic locality. All former Allanites-Ce from Trimouns seem to be Dissakisite-Ce.

Formula :
Ca(La,Ce)(Al₂Fe²⁺)(Si₂O₇₎₍)Si₂O₄)O(OH)
System: monoclinic Hardness:5-6 Rarity:not common
Strunz id:VIII/C.23-65 - SILICATES
Name origin: Named in 1810 by Thomas Thomson for Thomas Allan (1777-1833), Scottish mineralogist, who first observed the mineral. The Levinson rule suffix, -(Ce), was later added to designate this species as the Ce-dominant member among all allanites.