mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale; white, translucent, or yellowish color due to iron oxide staining; vitreous to greasy luster; trigonal crystal system; conchoidal fracture with no true cleavage; specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale; white, translucent, or yellowish color due to iron oxide staining; vitreous to greasy luster; trigonal crystal system; conchoidal fracture with no true cleavage; specific gravity of 2.65.
Formation & geological history
Formed through crystallization from silica-rich solutions or cooling magmas, subsequently weathered, transported by water, and rounded into a pebble shape in fluvial or marine environments.
Uses & applications
Used in landscaping, decorative gravel, glassmaking, electronics, and occasionally lapidary work.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust. Its resistance to chemical weathering allows it to survive long transport cycles, often ending up as quartz sand and pebbles.
Field identification & locations
Identified by its high hardness (scratches glass), lack of cleavage, and conchoidal fracture. Commonly found in riverbeds, beaches, and sedimentary deposits worldwide.
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