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, and hexagonal crystal structure. The specimen appears roughly broken or tumbled, with cloudy inclusions and translucency.

Identified August 9, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, pegmatites, and hydrothermal systems; milky cloudiness commonly comes from microscopic fluid inclusions or fractures. Quartz occurs from ancient Precambrian rocks to modern geological settings.

Uses & applications

Used extensively in glass, ceramics, electronics, abrasives, and engineered stone; attractive pieces are sold as inexpensive specimens or lapidary material. Typical value is about $2–$15 for a small common piece, or $20–$100+ if unusually clear, large, or well-crystallized.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure. It commonly occurs with feldspar, mica, and metallic ore minerals.

Field identification & locations

Identify it by its translucent white color, glassy appearance, lack of cleavage, and ability to scratch ordinary glass; it should not fizz in dilute acid. Common locations include Brazil, Madagascar, the United States, and worldwide quartz-bearing veins.