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Decomposed granite
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 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.
==Definition and composition==
Decomposed granite is rock of granitic origin that has weathered to the point that it readily fractures into smaller pieces of weak rock. Further weathering produces rock that easily crumbles into mixtures of gravel-sized particles, sand, and silt-sized particles with some clay. Eventually, the gravel may break down to produce a mixture of silica sand, silt particles, and clay. Different specific granite types have differing propensities to weather, and so differing likelihoods of producing decomposed granite.
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.〔Mitchell, J.K., and Soga, K. (2005) Fundamentals of soil behavior, Third edition, John Wiley and Sons, Inc., ISBN 9780471463023, pages 200-204.〕 The presence of clay allows water to seep in and further weaken the rock allowing it to fracture or crumble into smaller particles,〔 where, ultimately, the grains of silica produced from the granite are relatively resistant to weathering, and may remain almost unaltered.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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