mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent white to pale gray, vitreous-to-waxy luster, and massive microcrystalline structure without visible cleavage. The rounded shape and surface sheen indicate tumbling or natural abrasion.

Identified September 5, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in cavities, veins, and igneous or metamorphic rocks; quartz is common from Precambrian to modern environments. This specimen is likely a polished/tumbled piece rather than a naturally weathered pebble.

Uses & applications

Used for ornamental stone, carvings, countertops, abrasives, glass, electronics, and inexpensive jewelry. Common tumbled pieces generally have modest collector value.

Geological facts

Quartz fractures conchoidally and can scratch ordinary glass, but it is itself commonly scratched by harder materials only rarely. Milky appearance results from microscopic fluid inclusions, fractures, or impurities.

Field identification & locations

Common worldwide, including Brazil, Madagascar, the United States, and numerous hydrothermal vein districts. Confirm with a glass-scratch test and lack of cleavage; avoid confusing it with calcite, which is softer and cleaves readily.