mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent white to pale cream, with a vitreous-to-waxy luster and irregular conchoidal fracture. It has a trigonal crystal structure but no cleavage; specific gravity is about 2.65.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, or igneous rocks; the cloudy appearance results from microscopic fluid inclusions or fractures. Quartz is common from Precambrian rocks through modern geological settings.

Uses & applications

Used for glass, electronics, abrasives, countertops, and ornamental carvings; polished pieces are inexpensive decorative or lapidary specimens.

Geological facts

Quartz is the second-most-abundant mineral in Earth’s continental crust and is piezoelectric. The rounded shape and glossy surface indicate tumbling or natural abrasion.

Field identification & locations

Identify it by its glassy appearance, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass. Common worldwide, especially in granite, pegmatite, hydrothermal veins, and quartz-rich sedimentary rocks.