mineral

Tumbled white quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz or chalcedony

AI-generated identification · may be incorrect

Hardness 7 (quartz) or about 6.5–7 (chalcedony); white, translucent to opaque, with a waxy to vitreous luster and no cleavage. The smoothly rounded shape indicates natural water wear or tumbling; minor surface pits and beige staining are visible.

Identified August 27, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica crystallized in igneous, metamorphic, or hydrothermal settings, likely billions to millions of years old depending on its source rock. Its present shape formed through river, beach, or human tumbling processes.

Uses & applications

Used as a low-cost decorative stone, aquarium or landscaping material, craft stone, and occasionally in cabochons; this small piece has minimal commercial value.

Geological facts

Milky whiteness results from microscopic fluid inclusions or structural defects. If it is chalcedony rather than crystalline quartz, its silica occurs as extremely fine interlocking fibers.

Field identification & locations

Identify with a glass-scratch test: quartz should scratch ordinary glass; it should not fizz in dilute acid. Common worldwide, especially in quartz-rich gravels, veins, beaches, and riverbeds.