mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; creamy white to translucent, with a glassy-to-waxy luster and conchoidal fracture. It has a hexagonal crystal structure, though tumbling has rounded the specimen and obscured crystal faces; specific gravity is about 2.65.

Identified September 12, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in igneous, metamorphic, or hydrothermal veins; the milky appearance comes from microscopic fluid inclusions and fractures. Quartz is found throughout geologic time, commonly in granitic and metamorphic terrains.

Uses & applications

Used for glass, ceramics, abrasives, electronics, countertops, and ornamental objects; attractive pieces are sold as inexpensive lapidary material or tumbled stones.

Geological facts

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

Field identification & locations

Identify it by its hardness, lack of cleavage, pale color, and conchoidal fracture; it should scratch ordinary glass but not be scratched by a steel knife. Common worldwide, especially in Brazil, the United States, Madagascar, and the Alps.