mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Mohs hardness: 7, Color: Tan/brownish-yellow, Luster: Vitreous to waxy (weathered), Crystal structure: Trigonal/Hexagonal, Specific gravity: 2.65
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Physical properties
Mohs hardness: 7, Color: Tan/brownish-yellow, Luster: Vitreous to waxy (weathered), Crystal structure: Trigonal/Hexagonal, Specific gravity: 2.65
Formation & geological history
Formed via crystallization from magma or hydrothermal veins, later eroded and tumbled into a smooth pebble shape in a river or coastal environment.
Uses & applications
Construction aggregate, landscaping, source of silica for glassmaking, or as a decorative river rock.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. This specific specimen shows signs of iron-oxide staining giving it its brownish hue.
Field identification & locations
Can be identified by its hardness (scratches glass) and conchoidal fracture. Found worldwide in stream beds, beaches, and glacial deposits.
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