Mineralogy Database

Aenigmatite Mineral Data

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General Aenigmatite Information

Help on Chemical Formula: Chemical Formula: (Na,Ca)4(Fe++,Ti,Mg)12Si12O40
Help on Composition: Composition: Molecular Weight = 1,717.59 gm
   Sodium      4.99 %  Na    6.73 % Na2O
   Calcium     0.77 %  Ca    1.08 % CaO
   Magnesium   0.65 %  Mg    1.08 % MgO
   Zirconium   0.05 %  Zr    0.07 % ZrO2
   Titanium    5.85 %  Ti    9.77 % TiO2
   Manganese   1.28 %  Mn    1.65 % MnO
   Aluminum    1.01 %  Al    1.90 % Al2O3
   Zinc        0.04 %  Zn    0.05 % ZnO
   Iron       29.95 %  Fe   35.76 % FeO /  3.07 % Fe2O3
   Silicon    18.15 %  Si   38.83 % SiO2
   Oxygen     37.26 %  O
             ______        ______ 
             100.00 %       99.99 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na3.73Ca0.27Fe2+8.55Ti2.1Mg0.46Fe3+0.4Mn2+0.4Ca0.06Zn0.01Zr0.01Si11.1Al0.64Fe3+0.26O40
Help on Environment: Environment: A primary constituent in sodium-rich alkalic volcanics, pegmatites, and other silica-poor igneous rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1865
Help on Locality: Locality: Notable studied occurrences include: at Naujakasik, near the Tunugdliarfik Fjord, and on the Kangerdluarssuk Plateau, in the Ilimaussaq intrusion; from Narssarssuk; and elsewhere in Gr Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek for riddle, apparently an allusion to its (formerly) uncertain chemical composition.
Help on Name Pronunciation: Name Pronunciation: Aenigmatite + Pronunciation Say AENIGMATITE
Help on Synonym: Synonym: Cossyrite
  ICSD 15283
  PDF 46-1473