mineral

Milky quartz (raw quartz crystal)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent white to colorless, with a vitreous luster and irregular conchoidal fractures. It has a trigonal crystal structure and lacks cleavage; the cloudy appearance results from microscopic inclusions or fractures.

Identified September 2, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, and igneous pegmatites; individual specimens may range from ancient Precambrian host rocks to geologically young hydrothermal deposits. The pictured piece appears naturally fractured or roughly broken rather than well-formed.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, foundry materials, and electronics; attractive pieces are sold as inexpensive mineral specimens or used in décor and jewelry.

Geological facts

Quartz is one of Earth’s most abundant minerals and is highly resistant to weathering, commonly accumulating in sand and stream gravels.

Field identification & locations

Identify it by its glassy appearance, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass; unlike calcite, it does not fizz in dilute acid. Common worldwide, especially in Brazil, Madagascar, the United States, and alpine or hydrothermal veins.