mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, white to milky gray color, vitreous to greasy 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 milky gray color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed from hydrothermal veins, igneous pegmatites, or through the weathering and erosion of parent rocks where resistant quartz grains are transported by water and rounded into pebbles over time.
Uses & applications
Used in glassmaking, abrasives, electronics, ornamental items, and landscaping.
Geological facts
Quartz is one of the most abundant minerals in Earth's continental crust and is exceptionally resistant to weathering both chemically and physically.
Field identification & locations
Easily identified by its high hardness (scratches glass), lack of cleavage, and conchoidal fracture. Found worldwide in stream beds, beaches, and sedimentary deposits.
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