Quartz is made of

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. 

Quartz is made of   (1) Calcium Sulphate   (2) Calcium Silicate   (3) Sodium Sulphate   (4) Sodium Silicate

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