Mineralogy Database

Tvedalite Mineral Data

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General Tvedalite Information

Help on Chemical  Formula: Chemical Formula: (Ca,Mn++)4Be3Si6O17(OH)4•3(H2O)
Help on Composition: Composition: Molecular Weight = 764.79 gm
   Calcium    15.72 %  Ca   22.00 % CaO
   Manganese   7.18 %  Mn    9.28 % MnO
   Beryllium   3.54 %  Be    9.81 % BeO
   Silicon    22.03 %  Si   47.14 % SiO2
   Hydrogen    1.32 %  H    11.78 % H2O
   Oxygen     50.21 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca3Mn2+Be3Si6O17(OH)4•3(H2O)
Help on Environment: Environment: In vugs in a nepheline-syenite pegmatite. Always overgrown by a crust of chiavennite.
Help on IMA Status: IMA Status: Approved IMA 1992
Help on Locality: Locality: Vevja larvikite quarry, Tvedalen, Brunlanes, Vestfold Co., Norway. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the type locality.
Help on Name Pronunciation: Name Pronunciation: Tvedalite + Pronunciation Say TVEDALITE
Help on Synonym: Synonym: IMA1990-027