mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-waxy luster; hardness 7 Mohs, conchoidal fracture, no cleavage, and hexagonal crystal structure. The specimen appears massive rather than well-crystallized, with possible iron staining or surface weathering.

Identified September 14, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cool in veins, cavities, and fractures of igneous or metamorphic rocks; individual crystals may range from ancient Precambrian to recent geological ages. Exact age cannot be determined from the photograph.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, engineered stone, and electronics; attractive pieces are sold as inexpensive display or lapidary material.

Geological facts

Its cloudy appearance results from microscopic fluid inclusions, fractures, or impurities. Quartz is one of Earth’s most abundant minerals and is a major component of granite, sandstone, and many hydrothermal veins.

Field identification & locations

Identify by its glassy appearance, hardness, lack of cleavage, and conchoidal fracture; it should scratch ordinary glass but not be scratched by a steel knife. Common worldwide, especially in quartz veins and granitic terrains.