mineral

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; colorless to translucent with a glassy luster, hexagonal crystal structure, and no true cleavage (fractures conchoidally). The specimen appears naturally crystallized but partly broken or roughly trimmed.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, igneous melts, or metamorphic fluids, commonly in cavities and veins. Its age depends on the host rock and may range from recent mineralization to billions of years.

Uses & applications

Used for ornamental specimens, jewelry, optical components, electronics, and abrasives; clear, well-formed crystals can have modest collector value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, generating an electrical charge under pressure. Its characteristic crystal form is a six-sided prism often ending in pyramidal faces.

Field identification & locations

Identify it by glassy transparency, hardness sufficient to scratch ordinary glass, lack of cleavage, and commonly hexagonal faces. Common localities include Brazil, Madagascar, Arkansas, the Alps, and many quartz veins worldwide.