mineral

Tumbled quartz crystal

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Likely quartz: transparent to translucent, colorless to smoky gray, with vitreous luster and irregular conchoidal fractures. Mohs hardness 7; trigonal crystal structure; no cleavage; specific gravity about 2.65.

Identified September 20, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, igneous melts, or sedimentary veins; the rounded specimen has been mechanically tumbled and may contain inclusions or surface coatings. Quartz formed throughout Earth’s geological history.

Uses & applications

Common quartz is used for glass, ceramics, abrasives, electronics, and construction aggregate; attractive clear pieces are sold as decorative or metaphysical specimens.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric. The gray or cloudy appearance commonly results from fluid, gas, or mineral inclusions.

Field identification & locations

Identify it by its glassy luster, lack of cleavage, hardness sufficient to scratch ordinary glass, and conchoidal fracture; it commonly occurs in veins, granite, and geodes worldwide. The image is not sufficient to confirm whether it is quartz rather than glass or another clear mineral.