mineral
Quartz crystal fragment
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectTypically colorless to milky white with a vitreous luster; Mohs hardness 7, no cleavage, conchoidal fracture, and a trigonal crystal structure. The specimen appears translucent and may be naturally terminated or broken, though the image is not definitive.
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Physical properties
Typically colorless to milky white with a vitreous luster; Mohs hardness 7, no cleavage, conchoidal fracture, and a trigonal crystal structure. The specimen appears translucent and may be naturally terminated or broken, though the image is not definitive.
Formation & geological history
Quartz crystallizes from silica-rich hydrothermal fluids, pegmatites, and igneous or metamorphic rocks over broad geological ages. It is widespread in veins, cavities, and sedimentary deposits.
Uses & applications
Used in glass, ceramics, abrasives, electronics, and timekeeping; clear attractive crystals are collectible or used as inexpensive gemstones.
Geological facts
Quartz is one of Earth’s most abundant minerals and is highly resistant to weathering. Its hardness allows it to scratch ordinary glass.
Field identification & locations
Identify by its glassy luster, lack of cleavage, hardness, and typically six-sided prismatic habit; common sources include Brazil, Madagascar, the United States, and worldwide vein deposits.
