mineral

Rounded quartz-rich pebble, likely milky quartz

Quartz (SiO₂), possibly weathered quartzite or chalcedony

AI-generated identification · may be incorrect

Hardness 7 Mohs; cream-white, translucent to opaque, with a dull to weakly vitreous luster and no visible cleavage. The smooth rounded form indicates water or abrasion wear; specific gravity is about 2.65.

Identified September 5, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed in silica-rich igneous or metamorphic rocks and later released by weathering and transported in sediment or gravel. Its precise geological age and source cannot be determined from the photograph.

Uses & applications

Common quartz pebbles have little commercial value but are used for landscaping, crafts, tumbling, and educational collections; quartz itself is important in glass, ceramics, electronics, and construction aggregate.

Geological facts

Quartz is one of Earth’s most abundant minerals and is resistant to chemical weathering, allowing it to persist as rounded stream pebbles.

Field identification & locations

Test with a steel file or knife: quartz should resist scratching; it can scratch ordinary glass. Check for a glassy fracture and absence of fizzing in dilute acid; common sources include streambeds, gravel deposits, and quartz veins.