mineral

White quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent, vitreous-to-waxy luster, massive rather than visibly crystalline, with no prominent cleavage and conchoidal fracture. The rounded shape indicates natural water abrasion or tumbling.

Identified September 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich fluids crystallized in igneous or metamorphic rocks, commonly in veins and pegmatites; the specimen was later released by weathering and transported in gravel. Its exact geological age cannot be determined visually and may range from Precambrian to younger.

Uses & applications

Common quartz is used in glass, ceramics, engineered stone, abrasives, electronics, and construction aggregate; attractive pieces are sold as decorative or teaching specimens rather than jewelry-grade gems.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or impurities scattering light. Quartz is the second-most abundant mineral in Earth’s continental crust.

Field identification & locations

Identify it by its white translucency, glassy/waxy surface, lack of cleavage, and ability to scratch ordinary glass; it should not fizz in dilute acid. Common in streambeds and gravel deposits worldwide, especially quartz-vein terrains.