Mineralogy Database

Weeksite Mineral Data

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General Weeksite Information

Help on Chemical Formula: Chemical Formula: K2(UO2)2Si6O15•4(H2O)
Help on Composition: Composition: Molecular Weight = 1,028.91 gm
   Potassium   4.18 %  K     5.04 % K2O
   Barium      4.00 %  Ba    4.47 % BaO
   Calcium     0.39 %  Ca    0.55 % CaO
   Uranium    48.58 %  U    55.11 % UO2
   Silicon    13.65 %  Si   29.20 % SiO2
   Hydrogen    0.27 %  H     2.45 % H2O
   Oxygen     28.92 %  O
             ______        ______ 
             100.00 %       96.81 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K1.1Ba0.3Ca0.1(UO2)2.1Si5O13•1.4(H2O)
Help on Environment: Environment: In "opal" veinlets in rhyolite and agglomerates, as well as in sandstones and limestones.
Help on IMA Status: IMA Status: Approved IMA 1960
Help on Locality: Locality: Autunite No. 8 claim, Thomas Range, Juab County, Utah, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Mary Alice Dowse Weeks (1909-1988), mineralogist with the U.S. Geological Survey, noted specialist in the mineralogy of uranium and vanadium.
Help on Name Pronunciation: Name Pronunciation: Weeksite Say WEEKSITE
Help on Synonym: Synonym: ICSD 63515
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