mineral

Milky quartz

Quartz (SiO₂), commonly massive or vein quartz

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-waxy luster; Mohs hardness 7, no cleavage, conchoidal fracture, and a hexagonal crystal structure. The brown coating likely consists of iron-oxide staining or attached host rock.

Identified August 9, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids fill fractures and cool, commonly in hydrothermal veins, pegmatites, and metamorphic rocks. Individual specimens may range from Precambrian to recent geological ages.

Uses & applications

Used for glass, ceramics, abrasives, engineered stone, and electronics; attractive pieces are sold as cabinet specimens or lapidary material.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or impurities scattering light. Quartz is one of Earth’s most abundant and durable minerals.

Field identification & locations

Identify it by its hardness, glassy luster, lack of cleavage, and inability to scratch it with a steel knife; it should scratch ordinary glass. Common worldwide, especially in quartz veins and pegmatites.