mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on Mohs scale, yellowish-tan to grayish-brown color, vitreous to waxy luster, trigonal crystal structure, conchoidal fracture, specific gravity of 2.65.
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Physical properties
Hardness of 7 on Mohs scale, yellowish-tan to grayish-brown color, vitreous to waxy luster, trigonal crystal structure, conchoidal fracture, specific gravity of 2.65.
Formation & geological history
Formed in igneous, metamorphic, or sedimentary environments. Weathered and rounded through water transport in rivers or ocean shores over thousands to millions of years.
Uses & applications
Commonly collected as river rocks, used in landscaping, construction aggregates, or tumbled for lapidary hobbies.
Geological facts
Quartz is one of the most abundant minerals on Earth's continental crust. Rounded stream pebbles like this demonstrate mechanical weathering over time.
Field identification & locations
Can be identified by its hardness (scratches glass readily), smooth rounded shape from erosion, and lack of true cleavage. Found worldwide in riverbeds, beaches, and gravel deposits.
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Septarian Pebble
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Sandstone with Mineral Veining or Crust
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