Lalondeite Mineral Data

General Lalondeite Information
Chemical Formula:	(Na,Ca)6(Ca,Na)3Si16O38(F,OH)2•3(H2O)
Composition:	Molecular Weight = 1,441.00 gm
	Potassium 0.60 % K 0.72 % K₂O
	Sodium 8.50 % Na 11.46 % Na₂O
	Calcium 10.87 % Ca 15.22 % CaO
	Silicon 31.50 % Si 67.38 % SiO₂
	Hydrogen 0.49 % H 4.34 % H₂O
	Chlorine 0.17 % Cl 0.17 % Cl
	- % Cl -0.04 % -O=Cl₂
	Oxygen 46.57 % O
	Fluorine 1.31 % F 1.31 % F
	- % F -0.55 % -O=F₂
	______ ______
	100.00 % 100.01 % = TOTAL OXIDE
Empirical Formula:	Na_5.33Ca_0.91K_0.22Ca₃Si_16.16O₃₈F_0.99(OH)_0.94Cl_0.07�3(H₂O)
Environment:	Discovered on a single, handsized sample of altered breccia (or possibly, altered marble) collected in the summer of 1985. Reyerite group; structure determined.
IMA Status:	Approved IMA 2002 (Dana # Added)
Locality:	Poudrette quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada. Link to MinDat.org Location Data.
Name Origin:	Named for Andre Edmond Lalonde (b. 1955), Professor of Geology at the University of Ottawa, Ottawa, Ontario, Canada.
Synonym:	IMA2002-026