Sediment or soil particles ranging from 0.002/0.004-0.05/0.06 mm in diameter. Sediments are seldom composed entirely of silt but rather are a mixture of clay, silt, and sand. Silt is extremely fine grains of soil or sediment usually carried along in river water. Silt deposits formed by wind are known as loess, a yellow, unconsolidated rock. The term has no implications of color, organic content, or any property other than particle size or texture.