mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically Mohs hardness 7, white to translucent with a vitreous-to-waxy luster; trigonal crystal structure, indistinct cleavage, conchoidal fracture, and specific gravity about 2.65. The specimen appears rough and naturally broken, with possible minor translucency.

Identified September 16, 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; its age can range from recent to billions of years depending on the host rock. Common worldwide, including Brazil, Madagascar, the United States, and Europe.

Uses & applications

Used in glass, ceramics, abrasives, electronics, and engineered stone; attractive pieces are used for carving and inexpensive ornamental jewelry.

Geological facts

Its cloudy appearance results from microscopic fluid inclusions, fractures, or mineral impurities. It may be confused with white chalcedony, calcite, or man-made glass.

Field identification & locations

Identify it by its glassy luster, conchoidal fracture, lack of cleavage, and ability to scratch ordinary glass; calcite is much softer and reacts with dilute acid. Field localities include hydrothermal veins, pegmatites, and quartz-rich metamorphic rocks.