mineral
Quartz Rock
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale; color ranges from milky white to colorless; vitreous to greasy luster; trigonal crystal system; no true cleavage, exhibits conchoidal fracture; specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale; color ranges from milky white to colorless; vitreous to greasy luster; trigonal crystal system; no true cleavage, exhibits conchoidal fracture; specific gravity of 2.65.
Formation & geological history
Forms in a wide variety of geological environments, most notably in igneous rocks like granite and pegmatites, as well as hydrothermal veins and sedimentary rocks (sandstone). Geological age ranges from Precambrian to recent.
Uses & applications
Used in electronics, manufacturing of glass and ceramics, gemstone carvings, and as a decorative stone in landscaping.
Geological facts
Quartz is one of the most abundant and widely distributed minerals on Earth's continental crust. Its piezoelectric properties make it essential for keeping time in watches and electronic devices.
Field identification & locations
Easily identifiable in the field by its high hardness (scratches glass), lack of cleavage, and conchoidal fracture. Found globally in almost all rock types.
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