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Thomasclarkite-(Y)

Type Locality
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
Mineral Data
(Na,Ce)(Y,REE)(HCO3)(OH)3·4H2O
Strunz: 
5.DC.20
Physical Properties
Crystal System: 
Monoclinic
Hardness: 
2.0 - 3.0
Synonyms
Synonyms: 
Thomasclarkite-Y, Thomasclarkite Y and Thomasclarkite - Y