Mineralogy Database

Thorbastnasite Mineral Data

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General Thorbastnasite Information

Help on Chemical  Formula: Chemical Formula: Th(Ca,Ce)(CO3)2F2•3(H2O)
Help on Composition: Composition: Molecular Weight = 509.19 gm
   Calcium    5.90 %  Ca    8.26 % CaO
   Cerium     6.88 %  Ce    8.06 % Ce2O3
   Thorium   45.57 %  Th   51.85 % ThO2
   Hydrogen   1.19 %  H    10.61 % H2O
   Carbon     4.72 %  C    17.29 % CO2
   Oxygen    28.28 %  O
   Fluorine   7.46 %  F     7.46 % F
               -   %   F    -3.14 % -O=F2    
            ______        ______ 
            100.00 %      100.39 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: ThCa0.75Ce0.25(CO3)2F2•3(H2O)
Help on Environment: Environment: Metasomatic albitite and quartz´┐Żmuscovite veinlets in an alkaline exocontact surrounding a syenite intrusive.
Help on IMA Status: IMA Status: Approved IMA 1965
Help on Locality: Locality: Pichikhol alkaline massif, Balygtyg-Khem River, Sangilen Upland, Tuva, Siberia, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for a thorium-bearing mineral chemically similar to bastnasite.
Help on Name Pronunciation: Name Pronunciation: Thorbastnasite + Pronunciation Say THORBASTNASITE
Help on Synonym: Synonym: Thorbastnaesite