sedimentary
Quartz Pebble
Quartz (SiO2)
Hardness of 7 on the Mohs scale, typically gray or translucent white color, vitreous luster, 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 gray or translucent white color, vitreous luster, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed through mechanical weathering and aqueous transport of primary igneous or metamorphic quartz veins, resulting in rounded clastic sedimentary particles.
Uses & applications
Used in landscaping, decorative stone, construction aggregate, and abrasive manufacturing.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, able to survive extensive transport in rivers and beaches.
Field identification & locations
Identified by its high hardness (scratches glass), smooth water-worn shape, and resistance to chemical weathering. Found globally in riverbeds, beaches, and conglomeritic rock formations.
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