Decomposed granite

Eventually, the gravel may break down to produce a mixture of silica sand, silt particles, and clay.

The parent granite material is a common type of igneous rock that is granular, with its grains large enough to be distinguished with the unaided eye (i.e., it is phaneritic in texture); it is composed of plagioclase feldspar, orthoclase feldspar, quartz, mica, and possibly other minerals.

The chemical transformation of feldspar, one of the primary constituents of granite, into the clay mineral kaolin is one of the important weathering processes.

[1] The presence of clay allows water to seep in and further weaken the rock allowing it to fracture or crumble into smaller particles,[1] where, ultimately, the grains of silica produced from the granite are relatively resistant to weathering, and may remain almost unaltered.

DG can be installed and compacted to meet handicapped accessibility specifications and criteria, such as the ADA standards in the U.S.