Thomasclarkite-(Y) Mineral Data

General Thomasclarkite-(Y) Information
Chemical Formula:	(Na,Ce)(Y,REE)(HCO3)(OH)3•4(H2O)
Composition:	Molecular Weight = 375.77 gm
	Sodium 4.89 % Na 6.60 % Na₂O
	Cerium 7.46 % Ce 8.73 % Ce₂O₃
	La,Ce,Pr,Nd,Sm, 26.83 % RE 31.30 % REE₂O₃
	Yttrium 11.83 % Y 15.02 % Y₂O₃
	Hydrogen 3.22 % H 28.77 % H₂O
	Carbon 3.20 % C 11.71 % CO₂
	Oxygen 42.58 % O
	______ ______
	100.00 % 102.13 % = TOTAL OXIDE
Empirical Formula:	Na_0.8Ce_0.2Y_0.5REE_0.7(HCO₃)(OH)₃•4(H₂O)
Environment:	Occurs as a late hydrothermal phase in alkaline pegmatite dikes in nepheline syenite.
IMA Status:	Approved IMA 1998 (Dana # Added)
Locality:	Poudrette quarry, Mont Saint-Hilaire, Quebec, Canada. Link to MinDat.org Location Data.
Name Origin:	Named after Thomas Henry Clark (1893-1996), McGill University, Montreal, Quebec, Canada, noted for his studies of the geology of the St. Lawrence Lowlands.
Name Pronunciation:	Thomasclarkite-(Y) + Pronunciation
Synonym:	IMA1997-047