Mineralogy Database

Tobermorite Mineral Data

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General Tobermorite Information

Help on Chemical Formula: Chemical Formula: Ca5Si6O16(OH)2•4(H2O)
Help on Composition: Composition: Molecular Weight = 702.36 gm
   Calcium   24.54 %  Ca   34.33 % CaO
   Aluminum   1.92 %  Al    3.63 % Al2O3
   Silicon   21.99 %  Si   47.05 % SiO2
   Hydrogen   1.44 %  H    12.82 % H2O
   Oxygen    50.11 %  O
            ______        ______ 
            100.00 %       97.84 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca4.3Si5.5Al0.5O16(OH)2•4(H2O)
Help on Environment: Environment: A hydrothermal alteration product of calcium carbonate rocks, due to contact metamorphism and metasomatism. Filling vesicles and cavities in basaltic rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1880
Help on Locality: Locality: In Scotland, on the Isle of Mull, around Tobermory. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Tobermorite + Pronunciation Say TOBERMORITE
Help on Synonym: Synonym: Crestmoreite - mixture with wilkeite