mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, translucent to transparent, vitreous luster, conchoidal fracture, trigonal crystal system, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, translucent to transparent, vitreous luster, conchoidal fracture, trigonal crystal system, specific gravity of 2.65.
Formation & geological history
Formed through crystallization from silica-rich solutions or magmas, later weathered, transported, and rounded by water action in rivers or marine environments.
Uses & applications
Used in landscaping, decorative items, glass manufacturing, electronics, and as a collector or lapidary specimen.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust and is exceptionally resistant to weathering, allowing pebbles to survive long journeys in riverbeds.
Field identification & locations
Easily identified by its high hardness (scratches glass), lack of cleavage, and smooth, water-worn shape found in stream beds and beaches worldwide.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Soil with Mineral Detritus and Quartz Fragments
Regolith / Silicate Mineral Aggregate
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Limonite / Goethite (Iron Ore Mineral nodule)
FeO(OH)·nH2O / FeO(OH)
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Septarian Pebble
Septarian nodule / Concretion
sedimentary
Schist
Schist
Metamorphic
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral