mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale. Colors vary from white, colorless, to yellow, pink, or brownish staining from iron oxides. Vitreous luster. Trigonal crystal system, often massive or rounded in pebble form. Conchoidal fracture, no true cleavage. Specific gravity is approximately 2.65.
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Physical properties
Hardness of 7 on the Mohs scale. Colors vary from white, colorless, to yellow, pink, or brownish staining from iron oxides. Vitreous luster. Trigonal crystal system, often massive or rounded in pebble form. Conchoidal fracture, no true cleavage. Specific gravity is approximately 2.65.
Formation & geological history
Forms in virtually all geological environments - igneous, metamorphic, and sedimentary. Often survives weathering and erosion due to its extreme hardness and chemical resistance, forming smooth pebbles in rivers and beaches.
Uses & applications
Used in glassmaking, electronics, abrasives, gemstones, ornamental objects, and construction materials.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust. Its piezoelectric properties make it essential for watches and electronic oscillators.
Field identification & locations
Can be identified by its high hardness (scratches glass easily), lack of cleavage, and conchoidal fracture. Found worldwide in riverbeds, beaches, and various rock formations.
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