mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Usually white to translucent with a vitreous-to-waxy luster; hardness 7 Mohs, no cleavage, conchoidal fracture, and a hexagonal crystal structure. The specimen appears massive and irregular, with possible surface weathering or minor inclusions.

Identified August 9, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in igneous, metamorphic, or hydrothermal environments; individual specimens may range from Precambrian to recent geological ages. Commonly occurs in veins, cavities, pegmatites, and quartz-rich rocks.

Uses & applications

Used for glass, ceramics, foundry products, abrasives, electronics, and engineered stone; attractive pieces are sold as inexpensive mineral specimens or lapidary material.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure. Milky coloration commonly results from microscopic fluid inclusions or structural defects.

Field identification & locations

Identify it by its glassy appearance, lack of cleavage, hardness sufficient to scratch ordinary glass, and conchoidal fracture; it should not be confused with softer calcite. Common worldwide, especially in hydrothermal veins and pegmatites.