mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-waxy luster; Mohs hardness 7, no cleavage, conchoidal fracture, and trigonal crystal structure. The rounded shape indicates mechanical tumbling and polishing.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms in veins, cavities, and igneous or metamorphic rocks when silica-rich fluids crystallize; specimens may range from Precambrian to recent in age. The milky appearance comes from microscopic fluid inclusions or fractures.

Uses & applications

Used as a decorative and lapidary stone, inexpensive jewelry, carvings, and metaphysical collectibles; quartz is also important industrially in glass, ceramics, electronics, and abrasives.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric. Milky quartz generally lacks the transparency and clarity required for high-value gemstone use.

Field identification & locations

Identify it by its glassy appearance, hardness sufficient to scratch ordinary glass, lack of cleavage, and conchoidal fracture; common sources include Brazil, Madagascar, the United States, and worldwide quartz veins.