mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent with a vitreous-to-waxy luster, irregular fracture, and no cleavage. It has a trigonal crystal structure, though this rounded piece shows no obvious crystal faces; specific gravity is about 2.65.

Identified August 9, 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 Recent geological environments; the specimen appears naturally broken or tumbled.

Uses & applications

Used in glassmaking, ceramics, electronics, abrasives, and engineered stone; attractive milky pieces are sold as inexpensive decorative or lapidary material.

Geological facts

Its cloudy appearance results from microscopic fluid inclusions, fractures, or mineral impurities. Quartz is one of Earth’s most abundant and chemically resistant minerals.

Field identification & locations

Identify it by its white translucency, glassy sheen, lack of cleavage, and ability to scratch ordinary glass; a steel knife should not scratch it. Common worldwide, especially in quartz veins and granitic or metamorphic terrains.