mineral

Rounded quartz-rich pebble

Massive quartz (silicon dioxide, SiO₂), possibly milky quartz or quartzite

AI-generated identification · may be incorrect

White to gray, translucent patches, vitreous-to-dull luster, and irregular fracture; quartz hardness is Mohs 7, with no cleavage and specific gravity about 2.65. The rounded shape indicates natural water or abrasion, though the image cannot confirm whether it is quartz or quartzite.

Identified September 15, 2026More mineral →

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Physical properties

Formation & geological history

Likely weathered from a silica-rich igneous or metamorphic source and rounded in a stream, beach, or glacial deposit; its original mineral formation may be Precambrian to much younger. Quartz is common in many geological environments.

Uses & applications

Common quartz pebbles have little commercial value; quartzite is used as aggregate, decorative stone, and building material, while clear quartz is used in electronics and ornaments.

Geological facts

Quartz commonly scratches glass and does not fizz with dilute hydrochloric acid. White coloration results from microscopic fluid inclusions, fractures, or impurities.

Field identification & locations

Look for glassy luster, lack of cleavage, conchoidal fracture, and ability to scratch steel or glass; a streak test should be white. Common worldwide, especially in river gravels and quartz veins.