mineral

Milky quartz

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous-to-greasy luster, generally massive with no visible crystal faces; Mohs hardness 7, conchoidal fracture, no cleavage, specific gravity about 2.65. The tan coating likely reflects iron staining or weathered host rock.

Identified September 17, 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 common from Precambrian to modern geological settings. This specimen appears naturally fractured and weathered rather than highly gem-quality.

Uses & applications

Used for glass, ceramics, engineered stone, abrasives, electronics, and ornamentation; attractive translucent pieces are collected or polished, though this example is unlikely to have significant jewelry value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is the defining component of many quartz veins. Milky appearance results from microscopic fluid inclusions, fractures, or impurities scattering light.

Field identification & locations

Identify it by its glassy sheen, hardness sufficient to scratch ordinary glass, lack of cleavage, and conchoidal fracture; common worldwide in quartz veins, granites, pegmatites, and metamorphic terrains.