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1 - Boleite (T (Min)
2 - Legrandite (Min)
3 - Bastnäsite (Min)
4 - Allanite-( (Min)
5 - Monazite-( (Min)
6 - Tetrahedri (Min)
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27 - Grossular, (Rol)
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40 - Dufrenoysi (Min)
Allanite-(Ce) - Trimouns Talc Mine, Luzenac, Ariège, Midi-Pyrénées, France
(#:MINS9227)
A well shaped 6 mm crystals 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:15 gr.
Crystal size:6 mm tall
Overall size: 27mm x 18 mm x 24 mm
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