mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

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

Identified September 14, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids or melts crystallize in veins, cavities, and igneous rocks; its geological age may range from Precambrian to recent. The cloudy appearance results from microscopic fluid inclusions, fractures, or mineral impurities.

Uses & applications

Used for glass, ceramics, engineered stone, abrasives, electronics, and ornamental objects; attractive translucent pieces are collected but usually have modest value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is highly resistant to chemical and physical weathering, commonly accumulating in sedimentary deposits.

Field identification & locations

Identify it by hardness— it should scratch ordinary glass—and its lack of cleavage; avoid confusing it with calcite, which is softer and reacts with dilute acid. Common worldwide, especially in granite, pegmatite, quartz veins, and hydrothermal deposits.