mineral
Quartz pebble
Silicon dioxide (SiO2)
Hardness of 7 on the Mohs scale, white to clear color with some iron-staining (yellow/brown patches), vitreous to greasy luster, trigonal crystal system, no cleavage with conchoidal fracture, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, white to clear color with some iron-staining (yellow/brown patches), vitreous to greasy luster, trigonal crystal system, no cleavage with conchoidal fracture, specific gravity of 2.65.
Formation & geological history
Formed through crystallization from silica-rich solutions or cooling magma. Weathered out from parent rock (such as granite or vein quartz) and rounded into a pebble shape by water transport in rivers or beaches.
Uses & applications
Used in landscaping, decorative stone, and as raw material for glassmaking and silicon production.
Geological facts
Quartz is one of the most abundant and durable minerals in the Earth's continental crust, highly resistant to both chemical and mechanical weathering.
Field identification & locations
Found worldwide in stream beds, beaches, and glacial deposits. Easily identified by its high hardness (scratches glass) and conchoidal fracture.
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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
sedimentary
Limonite / Goethite (Iron Ore Mineral nodule)
FeO(OH)·nH2O / FeO(OH)
mineral
Septarian Pebble
Septarian nodule / Concretion
sedimentary
Schist
Schist
Metamorphic
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral