sedimentary
Gravel / Small Pebble
Rock Fragment (Gravel)
AI-generated identification · may be incorrectHardness varies (typically 6-7 if quartz-based), dull earthy to sub-vitreous luster, irregular jagged to sub-rounded pebble shape, brownish-grey color, small millimeter-scale size.
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Physical properties
Hardness varies (typically 6-7 if quartz-based), dull earthy to sub-vitreous luster, irregular jagged to sub-rounded pebble shape, brownish-grey color, small millimeter-scale size.
Formation & geological history
Formed through the mechanical weathering and breakdown of larger bedrock (igneous, sedimentary, or metamorphic), subsequently transported by wind, water, or gravity.
Uses & applications
Commonly used as construction aggregate, landscaping material, road base, and ballast.
Geological facts
Pebbles and gravel-sized fragments make up a huge portion of Earth's surface detritus and are the foundational elements for forming sedimentary conglomerate rocks.
Field identification & locations
Can be identified in the field by its small size, irregular shape, and grainy surface texture. Found virtually everywhere on Earth in soil, stream beds, and gravel pits.
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