mineral

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically hardness 7 Mohs, white to translucent, with a vitreous-to-waxy luster and no visible cleavage; trigonal crystal structure, though tumbling has rounded the specimen. Specific gravity is about 2.65.

Identified September 6, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous and hydrothermal fluids, then commonly survives weathering as a rounded alluvial or beach pebble. Quartz is geologically widespread and forms throughout Earth history; this piece is likely modernly tumbled or naturally water-worn.

Uses & applications

Used in glass, ceramics, electronics, abrasives, countertops, and lapidary work; attractive pieces are sold as inexpensive décor or metaphysical stones.

Geological facts

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

Field identification & locations

Identify it by its white translucency, glassy-to-waxy surface, lack of cleavage, and ability to scratch ordinary glass; a steel file will not scratch it. Common sources include stream gravels, beaches, pegmatites, and hydrothermal veins.