mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-waxy luster, conchoidal fracture, and no cleavage; Mohs hardness 7, trigonal crystal structure, and specific gravity about 2.65. The specimen appears massive and irregular rather than well crystallized.

Identified August 15, 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; its cloudy appearance results from microscopic fluid inclusions or fractures. Quartz is common from Precambrian rocks to the present.

Uses & applications

Used for glass, ceramics, engineered stone, abrasives, electronics, and construction aggregate; attractive pieces are sold as inexpensive cabinet or lapidary specimens.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric. Milky quartz commonly occurs with granite, pegmatite, hydrothermal veins, and quartz-rich metamorphic rocks.

Field identification & locations

Identify it by its white translucency, glassy sheen, lack of cleavage, and ability to scratch ordinary glass; it should not fizz in dilute acid. Common worldwide, especially in quartz veins and pegmatites.