Decomposed granite, also known as DG, is classification of rock that is derived from granite via its weathering to the point that the parent material readily fractures into smaller pieces of weaker rock. Further weathering yields material that easily crumbles into a mixtures of gravel-sized particles, that in turn may break down to produce a mixture of clay and silica sand or silt particles. Different specific granite types have differing propensities to weather, and so differing likelihoods of producing DG. It has practical uses that include its incorporation into paving and driveway materials, residential gardening materials in arid environments, as well as various types of walkways and heavy-use paths in parks. Different colors of DG are available, deriving from the natural range of granite colors from different quarry sources, and admixture of other natural and synthetic materials can extend the range of DG properties.

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