mineral

Tumbled quartz, likely milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent white to gray with cloudy internal veils, vitreous-to-waxy luster, and no visible cleavage. Trigonal crystal structure is obscured by tumbling; specific gravity is about 2.65.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, and igneous or metamorphic rocks; the cloudy appearance commonly results from microscopic fluid inclusions or defects. Quartz is widespread from ancient Precambrian rocks to modern hydrothermal veins.

Uses & applications

Used for ornamental stones, lapidary work, countertops, glass, ceramics, and electronics; this small tumbled piece is primarily decorative or collectible.

Geological facts

Quartz is one of Earth’s most abundant minerals and is harder than ordinary steel. The specimen may contain minor iron staining or inclusions, but its appearance is not diagnostic of a rare variety.

Field identification & locations

Identify by its glassy appearance, lack of cleavage, hardness, and inability to be scratched by a steel knife; a streak test should be white. Common worldwide, especially in Brazil, Madagascar, the United States, and Alpine regions.