mineral

Tumbled quartz (likely milky or included quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Translucent grayish-white with a vitreous to waxy luster and rounded tumbled surfaces; hardness 7 Mohs, poor cleavage, conchoidal fracture, and hexagonal crystal structure. Internal veils or fractures may create the cloudy appearance.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, or igneous rocks; inclusions and microfractures produce the cloudy color. Quartz ranges from Precambrian to modern geological ages and occurs worldwide.

Uses & applications

Common as a polished collectible, décor stone, and lapidary material; clear varieties are used in jewelry, glass, electronics, and oscillators. This small tumbled piece has modest commercial value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is the defining mineral of many quartz-rich rocks. A steel knife should not scratch it, while quartz can scratch ordinary glass.

Field identification & locations

Identify it by its glassy luster, translucency, lack of obvious cleavage, and high hardness; common sources include Brazil, Madagascar, the United States, and worldwide quartz veins. The image alone cannot confirm whether it is ordinary quartz, chalcedony, or another pale translucent stone.