Classification and designation of soils according to grain sizes (DIN EN ISO 14688-1) | |||||
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Soil group | Designation (Symbol) | Grain size [mm] | Icon | Remarks | |
Very coarse soil | Large boulder (LBo) |
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Boulder (Bo) |
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> Head size | |||
Cobble (Co) |
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< Head size > Chicken eggs |
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Coarse soil | Gravel (Gr) |
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< Chicken eggs > Match heads |
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Coarse gravel (CGr) |
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< Chicken eggs > Hazelnuts |
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Medium gravel (MGr) |
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< Hazelnuts > Peas |
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Fine gravel (FGr) |
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< Peas > Match heads |
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Sand (Sa) |
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< Match heads, but single grain still recognizable | |||
Coarse sand (CSa) |
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< Match heads > Semolina |
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Medium sand (MSa) |
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Some semolina | |||
Fine sand (FSa) |
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< Semolina, but single grain still recognizable | |||
Fine soil | Silt (Si) |
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Single grains not visible to the naked eye | ||
Clay (Cl) |
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