Mineralogy Database

Epistolite Mineral Data

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General Epistolite Information

Help on Chemical  Formula: Chemical Formula: (Na,[ ])2{(Na,Ti)4[Nb2(O,H2O)4Si4O14](OH,F)2}•2H2O
Help on Composition: Composition: Molecular Weight = 758.20 gm
   Sodium     11.49 %  Na   15.49 % Na2O
   Calcium     1.43 %  Ca    2.00 % CaO
   Titanium    0.25 %  Ti    0.42 % TiO2
   Manganese   0.29 %  Mn    0.37 % MnO
   Niobium    23.53 %  Nb   33.66 % Nb2O5
   Iron        0.29 %  Fe    0.42 % Fe2O3
   Silicon    14.82 %  Si   31.70 % SiO2
   Hydrogen    1.25 %  H    11.21 % H2O
   Oxygen     45.24 %  O
   Fluorine    1.40 %  F     1.40 % F
                -   %   F    -0.59 % -O=F2    
             ______        ______ 
             100.00 %       96.09 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na3.79Ca0.27Mn2+0.04Nb1.92Ti0.04Fe3+0.04(Si2O7)2O2(OH)1.44F0.56�4(H2O)
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1897
Help on Locality: Locality: Tugtupagtakorfia, Kvanefield, and Taseq slope, Ilimaussag intrusion, Julianehaab area, southern Greenland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the Greek for "letter" in allusion to the flat, rectangular form and white color.
Help on Name Pronunciation: Name Pronunciation: Epistolite + Pronunciation Say EPISTOLITE