mineral

Clear Quartz

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale; Color is colorless or transparent; Luster is vitreous (glassy); Crystal structure is hexagonal (trigonal); Conchoidal fracture with no true cleavage; Specific gravity is 2.65.

Identified August 1, 2026More mineral →

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Physical properties

Formation & geological history

Formed in hydrothermal veins, pegmatites, and as a secondary mineral in sedimentary rocks. Can form over millions of years as silica-rich fluids cool and crystallize.

Uses & applications

Used in electronics (oscillators), manufacturing of glass and silica, gemstone carving, and crystal collecting.

Geological facts

Clear quartz is one of the most abundant minerals in Earth's continental crust. It exhibits piezoelectricity, meaning it can generate an electrical charge in response to applied mechanical stress.

Field identification & locations

Easily identified by its hexagonal crystal habit, lack of cleavage, and ability to scratch glass due to its high hardness. Found worldwide, with major deposits in Brazil, the US, Madagascar, and the Alps.