sedimentary
Quartz / Limestone Gravel Pebble
Calcite (CaCO3) or Quartz (SiO2) aggregate
AI-generated identification · may be incorrectHardness 3 (calcite) to 7 (quartz) on the Mohs scale, off-white to pale gray color, dull to earthy luster, sub-angular to rounded shape.
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Physical properties
Hardness 3 (calcite) to 7 (quartz) on the Mohs scale, off-white to pale gray color, dull to earthy luster, sub-angular to rounded shape.
Formation & geological history
Formed through mechanical weathering and erosion of larger rock formations, transported by water or crushed for aggregate use.
Uses & applications
Commonly used in construction aggregate, landscaping, driveways, and road base materials.
Geological facts
Pebbles and small gravel fragments make up vast amounts of sedimentary deposits worldwide, constantly shaped by abrasion.
Field identification & locations
Identify by testing hardness or acid reaction (fizzes with dilute HCl if limestone). Extremely common in driveways, riverbeds, and construction fill.
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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