mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectTypically 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.
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Physical properties
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.
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.
