mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

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

Identified August 17, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids fill fractures or crystallize in igneous and metamorphic rocks; its geological age can range from recent to billions of years. Commonly occurs in quartz veins, pegmatites, granites, and hydrothermal deposits.

Uses & applications

Used for glass, ceramics, abrasives, electronics, engineered stone, and silica products; attractive translucent pieces are collected or occasionally cut for ornamental use.

Geological facts

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

Field identification & locations

Identify it by its white translucency, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass; it should not be confused with calcite, which is softer and cleaves readily. Common worldwide, including Brazil, Madagascar, the United States, and the Alps.