sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on Mohs scale, white to gray color, vitreous luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65.
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Physical properties
Hardness of 7 on Mohs scale, white to gray color, vitreous luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65.
Formation & geological history
Formed through the mechanical weathering and water transport of larger quartz rocks, smoothed over long periods in rivers or marine environments.
Uses & applications
Used in landscaping, decorative gravel, abrasive manufacturing, and as a common specimen for rock collectors.
Geological facts
Quartz is one of the most abundant minerals on Earth's continental crust and is exceptionally resistant to weathering.
Field identification & locations
Easily identified in the field by its high hardness (scratches glass) and smooth, rounded shape from water tumbling; found globally in stream beds and beaches.
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Sandstone or Siltstone
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Shale
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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