الكوارتز - transport-stevenard
Quartz WikipediaQuartz is a mineral composed of silicon and oxygen atoms in a continuous framework of SiO 4 silicon–oxygen tetredra, with each oxygen being shared between two tetredra, giving an overall chemical formula of SiO 2Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar Quartz crystals are chiral, and exist in two forms, the normal α quartz ...