mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, white or transparent color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity around 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, white or transparent color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity around 2.65.
Formation & geological history
Formed through crystallization from silica-rich hydrothermal solutions or cooling magma, often weathered out of pegmatites or quartz veins and rounded over time through sedimentary transport in rivers or beaches.
Uses & applications
Used in glassmaking, electronics, abrasives, gemstones, and decorative landscaping.
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
Easily identified by its high hardness (it scratches glass easily) and lack of cleavage. Found worldwide in almost all geological environments.
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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