mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent white to pale pink, vitreous luster, hexagonal crystal structure, and no true cleavage. The rounded shape and surface polish indicate human tumbling; internal fractures create cloudy areas.

Identified September 8, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, metamorphic, and hydrothermal fluids, commonly during Precambrian to recent geological events. This specimen was likely collected from quartz veins or quartz-rich gravel and then polished.

Uses & applications

Used for decorative stones, carvings, abrasives, countertops, and occasionally inexpensive jewelry or crystal collecting. Common tumbled pieces have modest commercial value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, generating an electrical charge under pressure. Its milky appearance usually results from microscopic fluid inclusions or fractures.

Field identification & locations

Identify it by its glassy luster, high scratch resistance, irregular conchoidal fractures, and lack of cleavage; it should scratch ordinary glass but not be scratched by steel. Common worldwide, especially in Brazil, Madagascar, the United States, and quartz-vein regions.