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 conchoidal fracture; Mohs hardness 7, no cleavage, and specific gravity about 2.65. The cloudy appearance results from microscopic fluid inclusions, fractures, or defects.

Identified August 17, 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. It occurs from Precambrian to modern geological settings and commonly accompanies granite, pegmatite, and hydrothermal veins.

Uses & applications

Used as a durable aggregate, glass and ceramic raw material, and occasionally for carvings, cabochons, and decorative specimens. Ordinary pieces have modest collector value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure. This specimen may also be called “snow quartz” if especially opaque and uniformly white.

Field identification & locations

Identify it by its glassy appearance, hardness sufficient to scratch ordinary glass, lack of cleavage, and conchoidal fracture; avoid confusing it with softer calcite. Common localities include Brazil, Madagascar, the United States, and worldwide quartz-bearing veins.