mineral

Milky quartz

Quartz (silicon dioxide, SiO₂), massive variety

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-waxy luster; hardness 7 Mohs, no cleavage, conchoidal fracture, and specific gravity about 2.65. The specimen appears massive and slightly weathered, with minor iron-oxide staining and dark matrix inclusions.

Identified September 4, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids fill fractures and cavities or crystallize in igneous and metamorphic rocks; individual specimens may range from Precambrian to recent in age. This rounded piece was likely naturally weathered or transported.

Uses & applications

Used as a silica source in glass, ceramics, engineered stone, and abrasives; attractive pieces are collected, but opaque milky quartz has limited jewelry value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric. Milky appearance results from microscopic fluid inclusions, fractures, or defects scattering light.

Field identification & locations

Identify by its glassy appearance, lack of cleavage, conchoidal fracture, and inability to be scratched by a steel knife; it should scratch ordinary glass. Common worldwide, especially in hydrothermal veins, pegmatites, and quartz-rich rocks.