mineral
White quartz pebbles
Quartz (silicon dioxide, SiO₂), likely milky quartz
AI-generated identification · may be incorrectTypically white to translucent with a vitreous-to-waxy luster; hardness 7 Mohs, no cleavage, conchoidal fracture, and hexagonal crystal structure. The rounded shapes indicate water or abrasion wear; gray markings may be inclusions or surface staining.
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Physical properties
Typically white to translucent with a vitreous-to-waxy luster; hardness 7 Mohs, no cleavage, conchoidal fracture, and hexagonal crystal structure. The rounded shapes indicate water or abrasion wear; gray markings may be inclusions or surface staining.
Formation & geological history
Quartz crystallizes from silica-rich igneous and hydrothermal fluids, commonly in granite, veins, and pegmatites, then survives weathering as durable stream or beach pebbles. The specimens cannot be assigned a specific geological age from the image.
Uses & applications
Used in glass, ceramics, electronics, abrasives, and engineered stone; attractive pieces are used for lapidary and inexpensive jewelry. These small rounded specimens have modest collecting value.
Geological facts
Quartz is one of Earth’s most abundant minerals and is highly resistant to weathering, allowing it to accumulate in sediment and placer deposits.
Field identification & locations
Identify by its glassy appearance, lack of cleavage, hardness sufficient to scratch ordinary glass, and white translucent interior; common in streambeds, beaches, gravel deposits, and quartz veins. Estimated value: $1–$10 for this group, depending on provenance and appearance.
