Silicate is a term used in the fields of mineralogy and chemistry.
Mineral formed from a tetrahedral repeating unit (SiO4) having one atom of silicon at the centre and oxygen atoms at the four vertices. Silicates make up the main mineral family: feldspars, feldspathoids, quartz, pyroxenes, olivine etc.; they enter into the composition of the majority of igneous or metamorphic rocks.
Quartz is a silicate. © Cobalt123, Flickr nc-sa 2.0