Loam

Loam is soil made mostly of sand and silt: 
Sand: particle size >  
Silt: particle size > 
Clay: small amount: particle size <  

By weight, it is about 40–40–20% concentration of sand–silt–clay, respectively. These proportions vary, and give different types of loam soils: sandy loam, silty loam, clay loam, sandy clay loam, silty clay loam, and loam.

 References 

Category:Soil