mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, white to clear coloration with yellowish or brownish iron staining, vitreous to waxy 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 to clear coloration with yellowish or brownish iron staining, vitreous to waxy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Forms in virtually all geological environments, particularly igneous, metamorphic, and sedimentary rocks. Weathering and water transport over long periods erode quartz crystals into smooth, rounded pebbles found in riverbeds and beaches.
Uses & applications
Used in decorative landscaping, polished gemstones, lapidary arts, and as aggregate in construction.
Geological facts
Quartz is one of the most abundant minerals in Earth's continental crust. Its high resistance to both mechanical and chemical weathering is why quartz pebbles are extremely common in riverbeds.
Field identification & locations
Can be identified by its high hardness (scratches glass) and conchoidal fracture. Found worldwide in stream beds, gravel pits, and coastal beaches.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
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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
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Schist
Schist
Metamorphic
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral