mineral
Quartz-rich translucent fragment
Quartz, silicon dioxide (SiO₂), possibly chalcedony or vein quartz
AI-generated identification · may be incorrectHardness about 7 Mohs; translucent gray to tan, vitreous-to-waxy luster, irregular conchoidal fracture, and no obvious cleavage. The layered appearance may reflect quartz intergrown with a fine-grained host or surface coating.
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Physical properties
Hardness about 7 Mohs; translucent gray to tan, vitreous-to-waxy luster, irregular conchoidal fracture, and no obvious cleavage. The layered appearance may reflect quartz intergrown with a fine-grained host or surface coating.
Formation & geological history
Likely formed from silica-rich hydrothermal fluids filling a fracture, or as chalcedony deposited in a cavity; exact geological age cannot be determined from the photograph. It may be a broken piece of quartz vein or silicified rock.
Uses & applications
Quartz is used in glass, ceramics, abrasives, electronics, and countertops; attractive translucent pieces may be sold as low-grade specimens or lapidary material.
Geological facts
Quartz is one of Earth’s most abundant minerals and commonly forms six-sided crystals, although broken fragments like this lack recognizable crystal faces.
Field identification & locations
Look for glassy luster, conchoidal fracture, and resistance to scratching glass; test carefully with a steel file, noting that quartz should not scratch easily. Common worldwide in veins, geodes, and igneous or metamorphic rocks.
