Grain size
Grain size
Diameter of individual grains of sediment, or of lithified particles in clastic rocks.
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Readers' pathsAug 2026 – Oct 2026
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Colloid
Mixture of an insoluble substance microscopically dispersed throughout another substance.
15%
Boulder
Natural rock fragment larger than 10 inches.
9.6%
Cobble (geology)
Clast of rock.
9.2%
Silt
Classification of soil or sediment.
8.5%
Sand
Granular material composed of finely divided rock and mineral particles.
8.4%
Clay
Fine grained natural soil.
7.3%
Gravel
Mix of crumbled stones.
6.8%
Crystallite
Small crystal which forms under certain conditions.
5.2%
Clastic rock
Sedimentary rocks made of mineral or rock fragments.
4.6%
Pebble
Small rock fragment.
3.6%
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Cobble (geology)
Clast of rock.
18%
Sandpaper
Abrasive material used for smoothing softer materials.
13%
Gravel
Mix of crumbled stones.
12%
Pebble
Small rock fragment.
10%
Sandstone
Type of sedimentary rock.
7.1%
Martian regolith
Fine regolith found on the surface of Mars.
4.8%
Sediment
Particulate solid matter deposited on a planetary surface.
3.1%
Silt
Classification of soil or sediment.
3.1%
Sand
Granular material composed of finely divided rock and mineral particles.
2.9%
Particle size
Notion for comparing dimensions of particles in different states of matter.
2.9%