mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent with a vitreous-to-waxy luster, massive structure, conchoidal fracture, and no cleavage. The smooth oval shape indicates human tumbling and polishing.

Identified August 20, 2026More mineral →

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Physical properties

Hardness 7 Mohs; white to translucent with a vitreous-to-waxy luster, massive structure, conchoidal fracture, and no cleavage. The smooth oval shape indicates human tumbling and polishing.

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, or igneous and metamorphic rocks; individual specimens may range from Precambrian to younger geological ages. Milky appearance results from microscopic fluid inclusions or fractures.

Uses & applications

Used for ornamental stones, carvings, countertops, abrasives, and inexpensive jewelry or meditation stones. Common tumbled pieces have modest collector value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is chemically resistant. Milky quartz can resemble white calcite, but quartz is harder and does not fizz in dilute acid.

Field identification & locations

Common worldwide, including Brazil, Madagascar, the United States, and the Alps. Test with a steel file or glass: quartz typically scratches glass and is not scratched by steel; avoid destructive testing on valuable pieces.