mineral
Clear quartz crystal
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectHardness 7 Mohs; colorless to smoky-clear, vitreous luster, trigonal crystal system, and no cleavage, with conchoidal fracture. The pictured piece appears to be a large, transparent quartz crystal, possibly cut or polished; its exact variety is uncertain from the image.
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Physical properties
Hardness 7 Mohs; colorless to smoky-clear, vitreous luster, trigonal crystal system, and no cleavage, with conchoidal fracture. The pictured piece appears to be a large, transparent quartz crystal, possibly cut or polished; its exact variety is uncertain from the image.
Formation & geological history
Quartz crystallizes from silica-rich fluids or melts in many geological settings; specimens may form over long periods in veins and cavities. Quartz occurs in rocks spanning much of Earth’s geological history.
Uses & applications
Used in jewelry, ornament, glassmaking, electronics, and timekeeping; large clear crystals are often displayed or collected.
Geological facts
Quartz is abundant in Earth’s crust and is piezoelectric, producing an electrical charge under mechanical pressure.
Field identification & locations
Look for glassy luster, hardness sufficient to scratch glass, and lack of cleavage; common worldwide in veins, pegmatites, and geodes. The image’s scale is unclear, so identification and valuation are approximate.
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Sandstone (with potential mineral staining/concretions)
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Epidote
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Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
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Granite
Granite (Phaneritic intrusive igneous rock)
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