mineral

Tumbled quartz pebble

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

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent cream to gray-brown coloration with a vitreous-to-waxy luster. It has a hexagonal crystal structure, but tumbling has rounded the shape and obscured cleavage; quartz has no true cleavage and conchoidal fracture.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, hydrothermal, or metamorphic fluids and may weather into rounded alluvial pebbles. Its precise geological age and source cannot be determined from the photograph.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and ornamental objects; attractive tumbled pieces are sold as inexpensive collectibles or jewelry components.

Geological facts

The cloudy appearance generally results from microscopic fluid inclusions, fractures, or mineral impurities. Brown coloration may indicate smoky quartz or iron staining.

Field identification & locations

Identify it by its glassy appearance, rounded tumbled form, and ability to scratch ordinary glass; it should not fizz in dilute acid. Common worldwide, especially in quartz-rich veins, pegmatites, and river gravels.