mineral

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically colorless and transparent to translucent, with a vitreous luster, conchoidal fracture, and no cleavage; Mohs hardness 7, trigonal crystal structure, and specific gravity about 2.65. The specimen appears to be a rough, fractured quartz fragment, though the image is not sufficient for exact identification.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids or igneous melts crystallize, and also occurs in veins and cavities of many rock types. Quartz is found throughout Earth’s geologic history, from ancient Precambrian rocks to modern deposits.

Uses & applications

Used in glass, electronics, abrasives, optical instruments, and construction aggregate; clear crystals are collected or used decoratively and occasionally in jewelry.

Geological facts

Quartz is one of the most abundant minerals in Earth’s continental crust and is piezoelectric, producing an electrical charge under pressure.

Field identification & locations

Identify by its glassy appearance, hardness, lack of cleavage, and ability to scratch ordinary glass; common localities include Brazil, Madagascar, the Alps, and Arkansas. A clear crystal with prominent natural faces may be rock crystal.