sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, clear, or light brown, vitreous luster, hexagonal crystal system when formed well, conchoidal fracture with no true cleavage, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, clear, or light brown, vitreous luster, hexagonal crystal system when formed well, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed from parent igneous or metamorphic rocks through weathering and erosion, then transported and rounded by water in rivers or beaches over thousands to millions of years.
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 Earth's continental crust, highly resistant to both chemical and mechanical weathering.
Field identification & locations
Found worldwide in riverbeds, beaches, and sedimentary deposits. Identified by its high hardness (scratches glass) and lack of cleavage.
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