mineral

Tumbled quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Likely hardness 7 Mohs, pale gray-white color, vitreous to sugary luster, and massive microcrystalline structure; no visible cleavage and typically conchoidal fracture. The rounded shape indicates tumbling or natural abrasion.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, metamorphic, and hydrothermal fluids, with specimens ranging from Precambrian to modern deposits. This piece may derive from quartz vein material or quartz-rich sediment.

Uses & applications

Used in glass, ceramics, electronics, abrasives, countertops, and collecting; attractive clear or colored varieties are used as gemstones. This specimen appears primarily ornamental.

Geological facts

Quartz is one of Earth’s most abundant minerals and has piezoelectric properties. Its gray appearance may result from microscopic inclusions, fractures, or surface coating.

Field identification & locations

Identify by its glassy/sugary luster, lack of cleavage, hardness, and inability to be scratched by a steel knife; it should scratch ordinary glass. Common worldwide, especially in quartz veins, granites, and river gravels.