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sorosilicate

[sawr-oh-sil-i-kit, -keyt, sohr-] /ˌsɔr oʊˈsɪl ɪ kɪt, -ˌkeɪt, ˌsoʊr-/
noun, Mineralogy
1.
any of the silicates in which each silicate tetrahedron shares one of its four oxygen atoms with a neighboring tetrahedron, the ratio of silicon to oxygen being two to seven.
Origin
< Greek sōró(s) heap + silicate
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Article for sorosilicate

any member of a group of compounds with structures that have two silicate tetrahedrons (a central silicon atom surrounded by four oxygen atoms at the corners of a tetrahedron) linked together. Because one oxygen atom is shared by two tetrahedrons, the chemical formula contains Si2O7, as in melilite or hemimorphite.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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