sedimentary
Quartz pebble
Silicon dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, clear, or light brown in color, vitreous to dull luster, conchoidal fracture, specific gravity of 2.65
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Physical properties
Hardness of 7 on the Mohs scale, typically white, clear, or light brown in color, vitreous to dull luster, conchoidal fracture, specific gravity of 2.65
Formation & geological history
Formed through the mechanical weathering and erosion of parent rocks containing quartz, followed by transport and deposition by water in streams or beaches
Uses & applications
Used in landscaping, decorative gravel, glassmaking raw material, and lapidary practice
Geological facts
Quartz is one of the most abundant and durable minerals in the Earth's continental crust, able to withstand weathering that destroys most other minerals
Field identification & locations
Can be identified in the field by its high hardness (scratches glass) and lack of cleavage; commonly found in riverbeds, beaches, and conglomerate rocks
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