mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous-to-waxy luster, massive rather than visibly crystalline, with no obvious cleavage and conchoidal fracture; Mohs hardness 7, specific gravity about 2.65. The rounded shape indicates mechanical tumbling and polishing.

Identified September 15, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, metamorphic, and hydrothermal fluids; milky appearance results from microscopic fluid inclusions or fractures. Quartz is common throughout Earth’s geological history, from Precambrian rocks to modern veins and sediments.

Uses & applications

Used for ornaments, cabochons, tumbling specimens, glass manufacture, abrasives, and electronics. This example has modest decorative and educational value.

Geological facts

Quartz is one of the most abundant minerals in Earth’s crust and is piezoelectric, producing an electrical charge under pressure.

Field identification & locations

Identify it by its glassy translucence, lack of cleavage, hardness sufficient to scratch ordinary glass, and conchoidal fracture; common sources include Brazil, Madagascar, the United States, and many gravel deposits. It may be distinguished from calcite because calcite is softer and cleaves readily.