mineral

Tumbled quartz (likely clear quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; transparent to translucent, colorless to faintly smoky, with a vitreous luster. It has a trigonal crystal structure and lacks cleavage, though tumbling produces a smooth rounded surface; internal fractures create bright reflections.

Identified August 13, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, pegmatites, and igneous rocks, and may later accumulate in sedimentary deposits. The specimen is human-tumbled and polished; its geological age cannot be determined from the image.

Uses & applications

Common in lapidary work, décor, crystal collections, abrasives, glassmaking, and electronics; clear gem-quality quartz is used occasionally in jewelry.

Geological facts

Its apparent rounded form and surface reflections indicate processing rather than natural crystal faces. It may be confused with glass, but quartz is harder and commonly shows irregular internal fractures or inclusions.

Field identification & locations

Likely quartz if it resists scratching by ordinary steel and shows no bubbles or perfectly uniform glassy texture; common worldwide, especially Brazil, Madagascar, and the United States. A definitive identification requires hardness, specific gravity, or refractive-index testing.