Mineralogy Database

Neptunite Mineral Data

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General Neptunite Information

Help on Chemical  Formula: Chemical Formula: KNa2Li(Fe++,Mn)2Ti2Si8O24
Help on Composition: Composition: Molecular Weight = 907.69 gm
   Potassium   4.31 %  K     5.19 % K2O
   Sodium      5.07 %  Na    6.83 % Na2O
   Lithium     0.76 %  Li    1.65 % Li2O
   Titanium   10.55 %  Ti   17.60 % TiO2
   Manganese   3.03 %  Mn    3.91 % MnO
   Iron        9.23 %  Fe   11.87 % FeO
   Silicon    24.75 %  Si   52.96 % SiO2
   Oxygen     42.30 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: KNa2LiFe2+1.5Mn2+0.5Ti2Si8O24
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1893
Help on Locality: Locality: Benitoite mine, San Benito, Co., California, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Neptune, the Roman god of the sea, because it was found with aegirine, named for the Scandinavian god of the sea.
Help on Name Pronunciation: Name Pronunciation: Neptunite + Pronunciation Say NEPTUNITE
Help on Synonym: Synonym: Carlosite
  ICSD 71360
  PDF 43-677