mineral

Tumbled quartz (likely rose or milky quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

The foreground specimen is a rounded, translucent cream-to-pink quartz pebble with a glassy-to-waxy luster; quartz has Mohs hardness 7, no cleavage, conchoidal fracture, and hexagonal crystal structure. The darker polished stone behind may be a separate mineral and cannot be identified reliably from this image.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in igneous, metamorphic, and sedimentary environments through cooling magma, hydrothermal veins, or recrystallization; its age depends on locality and may range from ancient Precambrian to recent. Tumbled surfaces are human-processed.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and engineered stone; attractive pink or translucent pieces are sold as decorative stones, cabochons, and inexpensive jewelry.

Geological facts

Quartz is one of Earth’s most abundant minerals and is chemically resistant, allowing it to survive weathering and accumulate in river gravels and beaches.

Field identification & locations

Identify it by hardness— it scratches ordinary glass—plus lack of cleavage and pale translucence; rose quartz commonly owes its color to microscopic inclusions. Common worldwide, especially in Brazil, Madagascar, India, and the United States.