mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, clear, or pale yellow in color, vitreous luster, trigonal crystal system, no true cleavage but exhibits conchoidal fracture, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, clear, or pale yellow in color, vitreous luster, trigonal crystal system, no true cleavage but exhibits conchoidal fracture, specific gravity of 2.65.
Formation & geological history
Formed through crystallization from silica-rich solutions or cooling magma, frequently rounded into pebbles by weathering, erosion, and water transport in streams, rivers, or beach environments over geological timescales.
Uses & applications
Used in landscaping, decorative stone, glass manufacturing, electronics, and lapidary work.
Geological facts
Quartz is one of the most abundant minerals in Earth's continental crust and is exceptionally resistant to both chemical and physical weathering, allowing it to persist long after other minerals have broken down.
Field identification & locations
Easily identified by its high hardness (scratches glass), lack of cleavage, and smooth water-worn shape. Commonly found in riverbeds, beaches, and alluvial deposits worldwide.
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