Mineralogy Database

Lawsonite Mineral Data

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General Lawsonite Information

Help on Chemical  Formula: Chemical Formula: CaAl2Si2O7(OH)2•(H2O)
Help on Composition: Composition: Molecular Weight = 314.24 gm
   Calcium   12.75 %  Ca   17.85 % CaO
   Aluminum  17.17 %  Al   32.45 % Al2O3
   Silicon   17.88 %  Si   38.24 % SiO2
   Hydrogen   1.28 %  H    11.47 % H2O
   Oxygen    50.91 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaAl2Si2O7(OH)2•(H2O)
Help on Environment: Environment: Originally described from a crystalline schist associated with serpentine. Also found as a secondary mineral in altered gabbros and diorites.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1895
Help on Locality: Locality: Reed Station, Tiburon peninsula, Marin County, California, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Andrew Cowper Lawson (1861-1952), Scottish-American geologist.
Help on Name Pronunciation: Name Pronunciation: Lawsonite + Pronunciation Say LAWSONITE
Help on Synonym: Synonym: ICSD 80835
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