Note: In mineralogical chemistry the silicates include; the
unisilicates or orthosilicates, salts of orthosilicic
acid; the bisilicates or metasilicates, salts of
metasilicic acid; the polysilicates or acid silicates,
salts of the polysilicic acids; the basic silicates or
subsilicates, in which the equivalent of base is
greater than would be required to neutralize the acid;
and the hydrous silicates, including the zeolites and
many hydrated decomposition products.