Coutinhoite Mineral Data

General Coutinhoite Information
Chemical Formula:	ThxBa1-2x(H2O)y(UO2)2Si5O13•H2O
Composition:	Molecular Weight = 2,118.94 gm
	Potassium 0.13 % K 0.16 % K₂O
	Barium 1.23 % Ba 1.37 % BaO
	Calcium 0.08 % Ca 0.11 % CaO
	Thorium 3.29 % Th 3.74 % ThO₂
	Uranium 67.40 % U 76.46 % UO₂
	Silicon 6.52 % Si 13.95 % SiO₂
	Phosphorus 0.12 % P 0.27 % P₂O₅
	Hydrogen 0.27 % H 2.43 % H₂O
	Oxygen 20.97 % O
	______ ______
	100.00 % 98.49 % = TOTAL OXIDE
Empirical Formula:	Th_0.3Ba_0.19K_0.07Ca_0.043(UO₂)₂Si_4.92P_0.08O_12.91�2.86(H₂O)
Environment:	Secondary hydrothermal mineral in a pegmatite from the oxidation of uraninite. Isostructural with weeksite.
IMA Status:	Approved IMA 2004 (Dana # Added)
Locality:	Corrego do Urcum granitic pegmatite, Lavra Urucum, Galileia Co., Minas Gerais, Brazil. Link to MinDat.org Location Data.
Name Origin:	Named for Jose Moacyr Vianna Coutinho (1924-), Professor of Mineralogy and Petrography the the Instituto de Geociencieas of Universidad de Sao Paulo, Brazil.
Synonym:	IMA2003-025