mineral

Tumbled quartz (likely milky quartz)

Quartz — silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent pale blue-white body, vitreous luster, conchoidal fracture, and no cleavage. The rounded form is human-tumbled; internal fractures and inclusions create the cloudy appearance.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids and igneous melts, commonly in veins and granitic rocks. Its precise geological age and locality cannot be determined from the image.

Uses & applications

Used as a lapidary and decorative stone, in crystal collecting, abrasives, glass, and electronics. This specimen has modest value, typically about $2–$10.

Geological facts

The blue appearance may result from lighting, internal fractures, or trace inclusions; it is not necessarily blue quartz. 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 fractures, and ability to scratch ordinary glass. Common sources include Brazil, Madagascar, the United States, and many granite-bearing regions.