Mineralogy Database

Magnesioastrophyllite Mineral Data

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General Magnesioastrophyllite Information

Help on Chemical  Formula: Chemical Formula: K2Na[Na(Fe++,Fe+++,Mn)Mg2]Ti2Si8O26(OH)4F
Help on Composition: Composition: Molecular Weight = 1,275.02 gm
   Potassium   6.13 %  K     7.39 % K2O
   Sodium      3.61 %  Na    4.86 % Na2O
   Magnesium   3.81 %  Mg    6.32 % MgO
   Titanium    7.51 %  Ti   12.53 % TiO2
   Manganese   2.15 %  Mn    3.10 % Mn2O3
   Iron       19.71 %  Fe   16.90 % FeO /  9.39 % Fe2O3
   Silicon    17.62 %  Si   37.70 % SiO2
   Hydrogen    0.32 %  H     2.83 % H2O
   Oxygen     37.64 %  O
   Fluorine    1.49 %  F     1.49 % F
                -   %   F    -0.63 % -O=F2    
             ______        ______ 
             100.00 %      101.88 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K2Na2Mg2Fe3+1.5Fe2+3Mn3+0.5Ti2Si8O26(OH)4F
Help on Environment: Environment: In a differentiated alkalic massif.
Help on IMA Status: IMA Status: Approved IMA 1963
Help on Locality: Locality: From Mts. Kukisvumchorr and Yukspor, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the magnesium content and relationship to astrophyllite.
Help on Synonym: Synonym: Magnesium astrophyllite - Renamed to Magnesioastrophyllite by Mineralogical Record, v39 (2008), p131