mineral

Tumbled quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Likely colorless to milky quartz with a translucent, rounded surface and vitreous luster. Mohs hardness 7; trigonal crystal structure, no cleavage, conchoidal fracture, and specific gravity about 2.65.

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, hydrothermal, and metamorphic environments, then commonly survives weathering as rounded alluvial or beach pebbles. The specimen’s precise age and locality cannot be determined from the image.

Uses & applications

Used in glass, ceramics, abrasives, electronics, and engineered stone; clear attractive pieces are collected or used decoratively. This small tumbled specimen has minimal commercial value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure. Its translucency and rounded shape suggest natural quartz that may have been tumbled or water-worn.

Field identification & locations

Identify it by its glassy luster, lack of cleavage, hardness sufficient to scratch ordinary glass, and white streak. Common worldwide, especially in river gravels, veins, pegmatites, and hydrothermal deposits.