Mineralogy Database

Oftedalite Mineral Data

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General Oftedalite Information

Help on Chemical  Formula: Chemical Formula: (Sc,Ca)2KBe3Si12O30
Help on Composition: Composition: Molecular Weight = 973.03 gm
   Potassium   3.94 %  K     4.74 % K2O
   Calcium     3.25 %  Ca    4.55 % CaO
   Yttrium     0.27 %  Y     0.35 % Y2O3
   Scandium    4.44 %  Sc    6.80 % Sc2O3
   Manganese   1.02 %  Mn    1.31 % MnO
   Beryllium   2.70 %  Be    7.48 % BeO
   Aluminum    0.25 %  Al    0.47 % Al2O3
   Iron        0.23 %  Fe    0.30 % FeO
   Silicon    34.58 %  Si   73.98 % SiO2
   Oxygen     49.33 %  O
             ______        ______ 
             100.00 %       99.98 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula:
Help on Environment: Environment: Occurs intergrown with Sc-rich milarite in the Heftetjern pegmatite. Milarite group
Help on IMA Status: IMA Status: Approved IMA 2004 (Dana # Added)
Help on Locality: Locality: Heftetjern pegmatite, about 4.3 km NW of T�rdal, Telemark county, southern Norway. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Ivar Oftedal (1894-1976), former Professor of Mineralogy at the Institute of Geology, University of Oslo, Norway.
Help on Synonym: Synonym: IMA2003-045a