mineral
Clear quartz crystal cluster
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectHardness 7 Mohs; colorless to milky, with vitreous luster and hexagonal crystal structure. Quartz has no true cleavage and breaks with conchoidal fracture; dark specks may be inclusions or surface impurities.
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Physical properties
Hardness 7 Mohs; colorless to milky, with vitreous luster and hexagonal crystal structure. Quartz has no true cleavage and breaks with conchoidal fracture; dark specks may be inclusions or surface impurities.
Formation & geological history
Quartz commonly crystallizes from silica-rich fluids in veins and cavities, or from cooling magma. Quartz is widespread in rocks of many geological ages.
Uses & applications
Used in jewelry, ornaments, glassmaking, electronics, and as a mineral specimen.
Geological facts
Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure.
Field identification & locations
Identify by its glassy luster, hardness sufficient to scratch glass, and lack of cleavage; common worldwide, especially in hydrothermal veins and pegmatites. The image appears to show a rough, colorless quartz cluster.
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Granite (Phaneritic intrusive igneous rock)
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