mineral

Clear quartz cabochon or tumbled quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Likely colorless, transparent to translucent quartz with a vitreous luster and conchoidal fracture; Mohs hardness 7, trigonal crystal system, no cleavage, and specific gravity about 2.65. The rounded polished shape indicates a cut or tumbled specimen.

Identified September 22, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, igneous melts, and sedimentary environments; quartz is widespread from Precambrian rocks to the present. The pictured piece appears human-polished rather than naturally crystallized.

Uses & applications

Used for jewelry, carvings, metaphysical items, optical/electronic components, glass, and abrasives. Clear gem-quality pieces are valued more than ordinary quartz.

Geological facts

Quartz is one of Earth’s most abundant minerals and commonly forms in geodes, veins, granite, and sandstone. It scratches ordinary glass but can itself be scratched by harder materials such as topaz or corundum.

Field identification & locations

Identify by its glassy luster, lack of cleavage, hardness, and usually colorless appearance; check for bubbles, which may indicate glass rather than quartz. Common worldwide, especially in Brazil, Madagascar, the United States, and the Alps.