mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness 7 on Mohs scale, yellowish-tan to translucent color, vitreous to waxy luster, trigonal crystal system, conchoidal fracture, no distinct cleavage, specific gravity ~2.65.
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Physical properties
Hardness 7 on Mohs scale, yellowish-tan to translucent color, vitreous to waxy luster, trigonal crystal system, conchoidal fracture, no distinct cleavage, specific gravity ~2.65.
Formation & geological history
Formed in igneous, metamorphic, or sedimentary environments, then weathered, water-worn, and rounded by stream or beach action into a smooth pebble.
Uses & applications
Commonly collected as river stones, used in landscaping, decorative stone mixes, and tumbling hobbies.
Geological facts
Quartz is one of the most abundant minerals in Earth's continental crust. Smooth water-worn quartz pebbles are ubiquitous on riverbeds and ocean beaches worldwide.
Field identification & locations
Identify by its hardness (scratches glass easily), smooth rounded shape, lack of cleavage, and translucent tan/yellow appearance. Commonly found in gravel beds, beach sand, and riverbanks.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
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FeO(OH)·nH2O / FeO(OH)
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Schist
Schist
Metamorphic
Septarian Pebble
Septarian nodule / Concretion
sedimentary
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
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Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
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