Heavy minerals (dark) in a quartz beach sand (Chennai, India). Sand is a naturally occurring granular material composed of finely divided rock and mineral particles.

Quartz is the second most abundant mineral in the Earth's continental crust, after feldspar. silica glass SiO2 which is formed by lightning strikes in quartz sand.

quartz n. A very hard mineral composed of silica, SiO 2 , found worldwide in many different types of rocks, including sandstone and granite

The primary component of typical beach sand is quartz, or silica (SiO2) Granites, shown below, are common plutonic rocks that have a high quartz content.

The uses and properties of the mineral Quartz with photos by Geology.com Quartz sands and finely ground silica sand are used for sand blasting, scouring cleansers,

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