Mineralogy Database

Hydroastrophyllite Mineral Data

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General Hydroastrophyllite Information

Help on Chemical Formula: Chemical Formula: (H3O,K)2Ca(Fe+++,Mn)5-6Ti2Si8O26(OH)4F
Help on Composition: Composition: Molecular Weight = 1,213.30 gm
   Potassium   1.61 %  K     1.94 % K2O
   Calcium     3.30 %  Ca    4.62 % CaO
   Titanium    5.52 %  Ti    9.22 % TiO2
   Manganese   8.15 %  Mn    7.60 % MnO /  3.25 % Mn2O3
   Niobium     3.06 %  Nb    4.38 % Nb2O5
   Aluminum    2.22 %  Al    4.20 % Al2O3
   Iron       16.11 %  Fe   23.03 % Fe2O3
   Silicon    16.20 %  Si   34.66 % SiO2
   Hydrogen    0.71 %  H     6.31 % H2O
   Oxygen     41.54 %  O
   Fluorine    1.57 %  F     1.57 % F
                -   %   F    -0.66 % -O=F2    
             ______        ______ 
             100.00 %      100.13 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (H3O)1.5K0.5CaFe3+3.5Mn2+1.3Mn3+0.5Ti1.4Nb0.4Si7AlO26(OH)4F
Help on Environment: Environment: Weathering product in an alkalic pegmatite.
Help on IMA Status: IMA Status: Approved IMA 1974
Help on Locality: Locality: Undefined locality in Sichuan Province, China. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its high water content and relationship to astrophyllite.