mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-waxy luster; Mohs hardness 7, no cleavage, conchoidal fracture, and trigonal crystal structure. The specimen appears massive and rough, without distinct crystals.

Identified August 26, 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 extremely ancient and occurs throughout Earth’s geologic history, so age cannot be determined from appearance alone.

Uses & applications

Used for glass, ceramics, engineered stone, abrasives, electronics, and ornamental specimens; attractive translucent pieces may be used in cabochons or carvings.

Geological facts

Its cloudy appearance is caused by microscopic fluid inclusions, fractures, or dispersed minerals. Quartz commonly resists weathering and accumulates in sand and placer deposits.

Field identification & locations

Common worldwide, especially in hydrothermal veins and granitic or metamorphic terrains. Identify it by its hardness, lack of cleavage, pale color, and ability to scratch glass; a steel knife should not scratch it.