mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a glassy-to-waxy luster; hardness 7 Mohs, no cleavage, conchoidal fracture, trigonal crystal structure, and specific gravity about 2.65. The rounded edges indicate natural or commercial tumbling.

Identified August 8, 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; milky appearance results from microscopic fluid inclusions or fractures. Quartz is common throughout geologic time, from ancient rocks to modern deposits.

Uses & applications

Used for lapidary cabochons, carvings, decorative stone, and inexpensive jewelry; quartz also has major industrial uses in glass, ceramics, electronics, and construction aggregate.

Geological facts

Quartz is one of Earth’s most abundant minerals and is highly resistant to weathering, allowing it to accumulate in stream gravels and beaches.

Field identification & locations

Identify it by its pale translucent color, glassy appearance, lack of cleavage, and ability to scratch steel or ordinary glass. Common localities include Brazil, Madagascar, the United States, and worldwide quartz-bearing veins.