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Dissakisite-(Ce)/Allanite-(Ce) - Trimouns Talc Mine, Luzenac, Ariège, Midi-Pyrénées, France
(#:MINS8858)
cluster of shaped crystal of this REE up to 1,0 cm long perched in contrasting matrix from this classic locality. All former Allanites-Ce from Trimouns seem to be Dissakisite-Ce.
Formula :
Ca(Ce,La)(Mg,Fe
2+
)(Al,Fe
3+
)
2
[O/OH/SiO
4
/Si
2
O
7
]
System:
monoclinic
Hardness:
5-6
Rarity:
very rare
Strunz id:VIII/C.23-70 - SILICATES
Name origin:
From the Greek for twice over, for a magnesium analog of allanite being described twice.
Specimen weight:43 gr.
Crystal size:Uo 10 mm long
Overall size: 55mm x 20 mm x 22 mm
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