Mineralogy Database

Sillimanite Mineral Data

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General Sillimanite Information

Help on Chemical  Formula: Chemical Formula: Al2SiO5 = Al[6]Al[4]OSiO4
Help on Composition: Composition: Molecular Weight = 162.05 gm
   Aluminum  33.30 %  Al   62.92 % Al2O3
   Silicon   17.33 %  Si   37.08 % SiO2
   Oxygen    49.37 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: (Al2O3)(SiO2)
Help on Environment: Environment: Metamorphosed peri-aluminous sedimentary rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1824
Help on Locality: Locality: Wide spread world wide occurrences. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the American chemist and mineralogist, B. Silliman (1779-1824).
Help on Name Pronunciation: Name Pronunciation: Sillimanite + Pronunciation Say SILLIMANITE
Help on Synonym: Synonym: Fibrolite
  ICSD 100450
  PDF 38-471