mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous luster; hardness 7 Mohs, no cleavage, conchoidal fracture, hexagonal crystal structure, and specific gravity about 2.65. The cloudy appearance results from microscopic fluid inclusions or structural defects.

Identified August 24, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids cool in veins and cavities, or crystallizes from silica-rich igneous rocks; specimens may range from Precambrian to modern geological ages. The image shows a rough, likely naturally broken fragment.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, engineered stone, and electronics; attractive pieces are sold as inexpensive mineral specimens or occasionally carved ornaments.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure. Its milky variety is generally less transparent and less valuable than clear rock crystal.

Field identification & locations

Identify by its glassy luster, hardness—scratches ordinary glass—and lack of cleavage; it should not fizz in dilute hydrochloric acid. Common worldwide in veins, pegmatites, and sedimentary deposits.