mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a glassy-to-waxy luster; hardness 7 Mohs, no cleavage, conchoidal fracture, and trigonal crystal structure. The specimen appears massive and rough, with possible iron-oxide staining.

Identified August 11, 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. Its white appearance results from microscopic fluid inclusions or fractures.

Uses & applications

Used in glassmaking, ceramics, engineered stone, abrasives, electronics, and construction aggregate; attractive pieces are collected or polished for décor and cabochons.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electric charge when stressed.

Field identification & locations

Identify by its glassy appearance, lack of cleavage, conchoidal fracture, and ability to scratch glass; a steel file will not scratch it. Common worldwide, especially in hydrothermal veins and granitic terrains.