mineral
Likely quartz pebble
Quartz, SiO₂
AI-generated identification · may be incorrectSmall, rounded, translucent gray-brown pebble with a vitreous-to-dull luster; quartz has hardness 7 (Mohs), a hexagonal crystal structure, and no cleavage. The photo alone does not show diagnostic crystal faces, so identification is tentative.
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Physical properties
Small, rounded, translucent gray-brown pebble with a vitreous-to-dull luster; quartz has hardness 7 (Mohs), a hexagonal crystal structure, and no cleavage. The photo alone does not show diagnostic crystal faces, so identification is tentative.
Formation & geological history
Quartz commonly crystallizes from silica-rich fluids or forms in igneous and metamorphic rocks; resistant fragments can be rounded by weathering and transport. Its age cannot be determined from the image.
Uses & applications
Quartz is used in glassmaking, electronics, abrasives, and jewelry; this small, unpolished piece is mainly a modest natural-history or craft specimen.
Geological facts
Quartz is one of Earth’s most abundant minerals and commonly survives erosion after softer minerals break down.
Field identification & locations
Look for hardness sufficient to scratch glass and a lack of cleavage; confirm against similar-looking chalcedony or other pebbles. Quartz occurs worldwide in veins, granite, and river or beach gravels.
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