mineral

Tumbled quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Likely quartz or quartz-rich material: pale cream/gray, translucent, dull to glassy luster, and rounded from tumbling. Quartz has Mohs hardness 7, hexagonal crystal structure, no cleavage, and specific gravity about 2.65; the image alone cannot confirm the exact variety.

Identified September 6, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous and hydrothermal fluids, or accumulates as durable grains in sedimentary deposits. Its geological age may range from recent sediment to billions of years, depending on its source.

Uses & applications

Used in glass, ceramics, electronics, abrasives, countertops, and as a common lapidary material. Small tumbled pieces are inexpensive decorative or metaphysical specimens.

Geological facts

Quartz is one of Earth’s most abundant minerals and commonly survives weathering because of its hardness and chemical resistance.

Field identification & locations

Look for a glassy appearance, white streak, lack of cleavage, and inability to scratch it with a steel knife; it should scratch ordinary glass. Common worldwide, but the exact locality and variety cannot be determined from this photograph.