mineral
Quartz pebble
Silicon dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white or translucent with a vitreous to greasy luster. No cleavage, conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically white or translucent with a vitreous to greasy luster. No cleavage, conchoidal fracture.
Formation & geological history
Formed through weathering and prolonged water abrasion (river or beach tumbling) of quartz-bearing rocks over thousands to millions of years.
Uses & applications
Commonly used in landscaping, decorative gravel, tumbling, and as a natural polished specimen for collectors.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust and is exceptionally resistant to weathering.
Field identification & locations
Easily identified by its high hardness (scratches glass) and smooth, water-worn shape. Found globally in riverbeds, beaches, and alluvial deposits.
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Limonite / Goethite (Iron Ore Mineral nodule)
FeO(OH)·nH2O / FeO(OH)
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Septarian Pebble
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Schist
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Metamorphic
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral