[sawr-oh-sil-i-kit, -keyt, sohr-] 
| 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. |
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.
Learn more about sorosilicate with a free trial on Britannica.com.
oʊˈsɪl