mineral

Tumbled quartz-rich pebble

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

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent gray-white to brownish, vitreous-to-waxy luster, irregular granular texture, no obvious cleavage, conchoidal fracture, and specific gravity about 2.65. Rounded edges indicate natural water wear or tumbling.

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed in silica-rich igneous or metamorphic veins and later released by weathering and transported in a stream or glacial deposit; its precise geological age cannot be determined visually.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and ornamental stone; attractive polished pieces are sold as inexpensive lapidary specimens.

Geological facts

The cloudy appearance commonly results from microscopic fluid inclusions, fractures, or dispersed minerals. Quartz is one of Earth’s most abundant and chemically durable minerals.

Field identification & locations

Identify it by its glassy luster, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass; a steel file will not scratch it. Common worldwide, especially in stream gravels and quartz veins.