sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, white to off-white coloration with a darker matrix attachment, vitreous to dull luster, hexagonal crystal system when formed well, conchoidal fracture, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, white to off-white coloration with a darker matrix attachment, vitreous to dull luster, hexagonal crystal system when formed well, conchoidal fracture, specific gravity of 2.65.
Formation & geological history
Formed through weathering and erosion of igneous, metamorphic, or older sedimentary rocks. Quartz is highly resistant to chemical and physical weathering, allowing it to survive transport in rivers and streams to become rounded pebbles.
Uses & applications
Used in landscaping, decorative stone, construction aggregate, and occasionally in lapidary work.
Geological facts
Quartz is one of the most abundant and durable minerals in the Earth's continental crust, making quartz pebbles a common find in riverbeds and beaches worldwide.
Field identification & locations
Can be identified in the field by its high hardness (scratches glass), lack of cleavage, and resistance to acid. Commonly found in stream beds, alluvial deposits, and conglomerate rocks.
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Quartz pebble
Silicon dioxide (SiO2)
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