![]() ![]() ![]() ![]() All silicate minerals have a base unit of a 4- silica tetrahedra-that is, a silicon cation coordinated by four oxygen anions, which gives the shape of a tetrahedron. The silicate class of minerals is subdivided into six subclasses by the degree of polymerization in the chemical structure. Minerals are classified by key chemical constituents the two dominant systems are the Dana classification and the Strunz classification. ![]()
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