mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-waxy luster; hardness 7 Mohs, no cleavage, conchoidal fracture, and hexagonal crystal structure. The brown and gray patches likely reflect iron staining or minor inclusions.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in cavities, veins, or igneous and metamorphic rocks; the specimen appears naturally rounded or tumbled. Quartz is common from Precambrian to recent geological settings worldwide.

Uses & applications

Used in glass, ceramics, abrasives, electronics, and engineered stone; attractive pieces are sold as inexpensive decorative or lapidary material.

Geological facts

Milky quartz is cloudy because microscopic fluid inclusions, fractures, or mineral impurities scatter light. It can scratch ordinary glass and steel but is itself vulnerable to impact and edge chipping.

Field identification & locations

Identify by its glassy appearance, lack of cleavage, hardness, and conchoidal fracture; common sources include Brazil, Madagascar, the United States, and India. A streak test is white, and it is nonmagnetic.