mineral
Clear quartz (rock crystal)
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectLikely a rough, translucent quartz crystal with a glassy luster and uneven fracture; quartz has Mohs hardness 7, a trigonal crystal structure, and no cleavage. The photo does not show enough detail to confirm the identification.
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Physical properties
Likely a rough, translucent quartz crystal with a glassy luster and uneven fracture; quartz has Mohs hardness 7, a trigonal crystal structure, and no cleavage. The photo does not show enough detail to confirm the identification.
Formation & geological history
Quartz forms in many settings, including silica-rich veins and cavities in igneous and metamorphic rocks; its age depends on the deposit and may range from millions to billions of years.
Uses & applications
Used in jewelry and collecting, and industrially for glass, abrasives, and electronic components.
Geological facts
Quartz is one of Earth’s most abundant minerals and commonly forms six-sided crystals.
Field identification & locations
Look for glassy luster, hardness sufficient to scratch glass, and lack of cleavage; common worldwide in veins, geodes, and pegmatites. The pictured piece’s small size and uncertain identity limit valuation.
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Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous