Quartz is extensively used as a piezoelectric material, it contains-

1. Pb 2. Si
3. Ti 4. Sn
 
 



Hint: Crystalline forms of silica SiO2 is quartz

Quartz, cristobalite, and tridymite are some of the crystalline forms of silica and they are interconvertible at suitable temperatures. Quartz is extensively used as a piezoelectric material.