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 cleavage. Specific gravity is approximately 2.65.
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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 cleavage. Specific gravity is approximately 2.65.
Formation & geological history
Formed from parent rocks containing quartz that have undergone weathering, erosion, and extensive water transport in rivers or marine environments, rounding them into pebbles.
Uses & applications
Used in landscaping, decorative stone, construction aggregate, and as tumbling rough for lapidary arts.
Geological facts
Quartz is one of the most abundant and durable minerals in the Earth's continental crust, which is why it frequently survives long journeys in rivers to become smooth pebbles.
Field identification & locations
Found worldwide in stream beds, beaches, and alluvial gravel deposits. Easily identified by its high hardness (scratches glass) and lack of cleavage.
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