mineral

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent white to colorless, with a vitreous luster and irregular conchoidal fracture. Trigonal crystal structure is obscured by tumbling; no cleavage, specific gravity about 2.65.

Identified August 18, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous and hydrothermal fluids, commonly in veins and pegmatites; these grains may be millions to billions of years old. The smooth shape is human-produced by tumbling and polishing.

Uses & applications

Used for ornamental stones, carvings, counters, abrasives, glass, and electronics; modest jewelry and collecting appeal.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or defects scattering light. Quartz is one of Earth’s most abundant minerals.

Field identification & locations

Identify it by its glassy luster, hardness sufficient to scratch ordinary glass, lack of cleavage, and white translucent appearance. Common sources include Brazil, Madagascar, the United States, and worldwide quartz veins.