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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)(Al
2
Fe
2+
)(Si
2
O
7)(
)Si
2
O
4
)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.
Specimen weight:48 gr.
Crystal size:Up to 9 mm tall
Overall size: 38mm x 24 mm x 38 mm
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