mineral

Milky quartz

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7; white to translucent, vitreous-to-pearly luster, commonly massive with irregular fracture and no cleavage. The specimen appears to be coarse, sugary milky quartz, possibly with minor feldspar or calcite inclusions.

Identified September 4, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids or late-stage igneous fluids crystallize in veins and cavities, commonly during Precambrian to younger mountain-building events. Quartz veins occur in many rock types worldwide.

Uses & applications

Used for glass, ceramics, abrasives, engineered stone, and silicon production; attractive pieces are sold as cabinet specimens, though this rough material has limited gemstone value.

Geological facts

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

Field identification & locations

Identify by its glassy translucence, hardness sufficient to scratch ordinary glass, lack of cleavage, and six-sided crystals when developed. Common localities include Brazil, Madagascar, the United States, China, and the Alps.