Natural Quartz (Dur-e-Najaf) 26.50crt (QZ017) is made of the two most abundant chemical elements on Earth.Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The atoms are linked in a continuous framework of SiO4 silicon–oxygen tetrahedra .Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral.The name is from a misreading of mormorion in Pliny the Elder.^{[9]Cairngorm is a variety of smoky quartz found in the Cairngorm Mountains of Scotland.}