mineral

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Hardness: 7 on the Mohs scale. Color: Clear to white, sometimes with faint purplish or brownish tints. Luster: Vitreous (glassy). Crystal structure: Trigonal, typically forming six-sided prisms ending in a six-sided pyramid. Cleavage: None (exhibits conchoidal fracture). Specific gravity: 2.65.

Hardness: 7 on the Mohs scale
Luster: Vitreous (glassy)

Identified July 30, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins, pegmatites, and as a secondary mineral in sedimentary rocks and cavities (such as geodes). Can form over millions of years from silica-rich aqueous solutions.

Uses & applications

Used in electronics, optical instruments, gemstone carving, ornamental displays, and crystal healing collections.

Geological facts

Quartz is one of the most abundant minerals in Earth's continental crust. It exhibits piezoelectric properties, meaning it can generate an electrical charge in response to applied mechanical stress, making it useful in watches and electronic oscillators.

Field identification & locations

Easily identified by its distinct hexagonal crystal habit, lack of cleavage, and hardness (scratches glass easily). Found worldwide, with major deposits in Brazil, the USA, Madagascar, and the Alps.