mineral

Tumbled quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky/included quartz

AI-generated identification · may be incorrect

Mohs hardness 7; pale gray-white with translucent edges, vitreous to waxy luster, and no obvious cleavage. It has a hexagonal crystal structure, though tumbling has rounded its shape; specific gravity is about 2.65.

Identified September 5, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, pegmatites, and igneous rocks, or accumulates as a resistant sedimentary pebble. Its precise geological age and source cannot be determined from the photograph.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and countertops; attractive pieces are sold as inexpensive lapidary or metaphysical specimens.

Geological facts

Quartz is one of Earth’s most abundant and durable minerals. The cloudy appearance usually results from microscopic fluid inclusions, fractures, or other mineral impurities.

Field identification & locations

Identify it by its glassy appearance, lack of cleavage, and ability to scratch ordinary glass; a steel knife should not scratch it. Common worldwide, especially in quartz veins, pegmatites, and river gravels.