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, with conchoidal fracture and no cleavage. The rounded shape indicates mechanical tumbling or water wear; visible internal wisps may reflect inclusions or fractures.

Identified August 24, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous and hydrothermal fluids, or forms in metamorphic veins; Earth’s quartz ranges from Precambrian to modern. This specimen has been human-polished, so its original locality cannot be determined visually.

Uses & applications

Common as a lapidary and decorative stone, in crystal collections, and occasionally in inexpensive jewelry; quartz is also important industrially for glass, ceramics, abrasives, and electronics.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or mineral impurities scattering light. Quartz is one of Earth’s most abundant minerals and is the defining component of many quartz-rich rocks.

Field identification & locations

Identify by its glassy appearance, conchoidal fracture, lack of cleavage, and ability to scratch ordinary glass; it should not be scratched by a steel knife. Common sources include Brazil, Madagascar, the United States, and many quartz-vein regions.