sedimentary
Quartz pebble
Silicon dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, gray, or clear in color, vitreous luster, conchoidal fracture, and no true cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, gray, or clear in color, vitreous luster, conchoidal fracture, and no true cleavage.
Formation & geological history
Formed through the weathering and erosion of quartz-bearing rocks, followed by transport in water streams which rounds the edges into pebbles over long geological timescales.
Uses & applications
Used in landscaping, decorative gravel, aggregate in construction, and occasionally in glassmaking or lapidary arts.
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 survive long journeys in riverbeds.
Field identification & locations
Can be identified by its high hardness (scratches glass), conchoidal fracture, and lack of reaction to acid. Commonly found in riverbeds, beaches, and conglomeratic sedimentary rocks worldwide.
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