mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, milky white to yellowish-brown color due to iron 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, milky white to yellowish-brown color due to iron 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 in igneous, metamorphic, and sedimentary environments. Over long periods, water and wind erosion smooths jagged quartz into rounded pebbles in riverbeds and beaches.
Uses & applications
Used in landscaping, decorative stone, abrasive manufacturing, glassmaking, and gemstone carving or lapidary work.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust. Its high resistance to chemical and physical weathering allows it to survive long transport cycles in rivers and oceans.
Field identification & locations
Easily identified by its high hardness (it scratches glass easily) and lack of cleavage. Commonly found in stream beds, gravel bars, and beaches worldwide.
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