Quartz is made of
(1) Calcium Sulphate
(2) Calcium Silicate
(3) Sodium Sulphate
(4) Sodium Silicate
Answer: (4) Quartz is an abundant mineral in the Earth’s continental crust. It is made up of a continuous framework of SiO4 silicon-oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall formula SiO2. There are many different varieties of quartz, several of which are semi-precious gemstones. Most quartz used in microelectronics is produced synthetically. Large, flawless, and un-twinned crystals are produced in an autoclave via the hydrothermal process. The process involves treating crushed natural quartz with a hot aqueous solution of a base such as sodium hydroxide.
