mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent, with a vitreous-to-waxy luster and irregular fracture; hardness 7 Mohs, no cleavage, hexagonal crystal structure, and specific gravity about 2.65. The specimen appears massive and locally iron-stained or weathered.

Identified August 24, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids or late-stage igneous fluids fill fractures and cavities, or crystallizes in quartz veins; individual crystals may range from ancient Precambrian to geologically recent. The image does not allow a precise age or locality determination.

Uses & applications

Used as aggregate, silica feedstock, glass and ceramic material, and abrasives; attractive pieces are collected or cut for cabochons and carvings. Common specimens generally have modest commercial value.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or defects scattering light. Quartz is one of Earth’s most abundant minerals and is often associated with gold-bearing veins.

Field identification & locations

Common in quartz veins, granites, pegmatites, metamorphic rocks, and stream gravels worldwide; major sources include Brazil, Madagascar, the Alps, and the United States. Confirm with hardness testing against glass, absence of cleavage, and conchoidal fracture; avoid damaging collectible specimens.