Mineralogy Database

Cummingtonite Mineral Data

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General Cummingtonite Information

Help on Chemical Formula: Chemical Formula: [ ]Mg7Si8O22(OH)2
Help on Composition: Composition: Molecular Weight = 780.82 gm
   Magnesium  21.79 %  Mg   36.13 % MgO
   Silicon    28.78 %  Si   61.56 % SiO2
   Hydrogen    0.26 %  H     2.31 % H2O
   Oxygen     49.18 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg7(Si8O22)(OH)2
Help on Environment: Environment: Contact and regional metamorphic rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1824
Help on Locality: Locality: Cummington, Massachusetts, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Synonym: Synonym: ICSD 81355
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