Does silt have good water infiltration and holding capacity?
Silt does have good water infiltration and holding capacity, because silt is composed of a specific size of rock particles formed by the erosion of stones and bedrock such as quartz and feldspar.
Water has little resistance to flow through the granular rock particles and it percolates through silt readily.
Silty loam has the highest water holding capacity since it is a medium grained soil that allows water to flow into it and it holds with good retention capacity.
Infiltration and holding capacity is discussed here: