Quartz example sentences

Feldspar and quartz are the most common minerals found in rocks.Quartz is extensively used as a piezoelectric material; it has made possible to develop extremely accurate clocks, modern radio and television broadcasting and mobile radio communications.Gneissoid, granite, syenite, slate, schist, marble, quartzite etc.Silicon, used in the computer industry is obtained from quartz.Quartz, cristobalite and tridymite are some of the crystalline forms of silica, and they are interconvertable at suitable temperature.