mineral

Milky quartz (likely rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Typically hardness 7 Mohs, white to translucent, with a glassy-to-waxy luster and hexagonal crystal structure; quartz has no true cleavage and commonly shows conchoidal fracture. The specimen appears unusually rounded and translucent, possibly tumbled or water-worn.

Identified August 20, 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; quartz is widespread from Precambrian to modern geological settings. Exact age and locality cannot be determined from the image.

Uses & applications

Used in glass, ceramics, electronics, abrasives, and construction aggregate; attractive milky quartz is sold as a decorative or collecting specimen, though it is generally not a high-value gemstone.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or mineral impurities scattering light. It can scratch ordinary glass but should not be confused with man-made glass or calcite.

Field identification & locations

Look for a cool, glassy surface, conchoidal fracture, lack of cleavage, and ability to scratch glass; a steel nail will not scratch it. Common worldwide, including Brazil, Madagascar, the United States, and the Alps.