Lecoqite-(Y)
Lecoqite-(Y) is an IMA-recognized mineral species in the carbonate class, with the chemical formula Na₃Y(CO₃)₃·6H₂O.
It crystallizes in the hexagonal crystal system (space group P6_3).
Key properties: specific gravity 2.358; White streak; Silky luster; optically uniaxial.
IMA symbol Lec-Y, IMA status: approved, named in 2008.
A late-stage hydrothermal mineral in association with a hyperagpaitic pegmatite.
It is found associated with Microcline, albite, natrolite, gonnardite, aegirine, siderite, elpidite, gaidonnayite, zircon, franconite, dawsonite, rhodochrosite, cryolite, rutile.
The mineral was named to honor the French chemist P.É. Lecoq de Boisbaudran (1838–1912) and for the dominant rare earth element in its composition.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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