sedimentary
Pebble / Gravel
Clastic Sedimentary Specimen (likely Limestone or Quartzite base)
Hardness: 3-7 Mohs depending on composition; Color: Gray, tan, and earthy tones; Luster: Dull to earthy; Texture: Granular or smooth due to erosion.
- Hardness
- 3-7 Mohs depending on composition
- Color
- Gray, tan, and earthy tones
- Luster
- Dull to earthy
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Physical properties
Hardness: 3-7 Mohs depending on composition; Color: Gray, tan, and earthy tones; Luster: Dull to earthy; Texture: Granular or smooth due to erosion.
Formation & geological history
Formed through the weathering and erosion of larger rock masses, transported by water or wind, and often rounded by abrasive movement in rivers or glacial deposits.
Uses & applications
Used primarily as aggregate in construction, road base, landscaping, and in the production of concrete and asphalt.
Geological facts
Pebbles are defined by the Udden-Wentworth scale as particles with a particle size of 4 to 64 millimeters. Geologically, they are the building blocks of conglomerate rocks.
Field identification & locations
Commonly found in river beds, beaches, and glacial till. Field identification involves checking for rounding and grain size; can be tested with acid to check for calcium carbonate (limestone).
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