mineral

Quartz (Clear to Smokey)

Silicon Dioxide (SiO2)

7.0 Hardness (Mohs scale), translucent to clear color with internal inclusions, vitreous luster, hexagonal (trigonal) crystal system, conchoidal fracture, specific gravity 2.65

Identified June 24, 2026More mineral →

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Physical properties

7.0 Hardness (Mohs scale), translucent to clear color with internal inclusions, vitreous luster, hexagonal (trigonal) crystal system, conchoidal fracture, specific gravity 2.65

Formation & geological history

Forms in a wide variety of environments, most commonly by crystallizing from molten magma, hydrothermal veins, or as a secondary mineral in sedimentary rocks. Can be found in geological formations of almost any age.

Uses & applications

Extensively used in electronics for oscillators, in glass manufacturing, as an abrasive, and widely used in jewelry and lapidary arts as a semi-precious gemstone.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is piezoelectric, meaning it generates an electric charge when mechanical stress is applied.

Field identification & locations

Identify by its hardness (it can scratch glass), its conchoidal (shell-like) fracture, and lack of cleavage. Look for point-growth patterns or hexagonal prism shapes in vugs or vein outcrops.