USDA texture triangle

Ternary diagram that classifies soils by relative proportion of sand (2.0 to 0.05 mm), silt (0.05 to 0.002 mm) and clay (less than 0.002 mm) into 12 classes (sand, loamy sand, sandy loam, loam, silt loam, silt, clay loam, sandy clay loam, silty clay loam, sandy clay, silty clay, clay).