Argillaceous siltstone is mainly composed of silt and clay mineralsThe main composition of sandy mudstone is clay mineral, containing a small amount of sandThe fracture of the argillaceous siltstone is more rough than that of the sandy mudstoneHand rub, then silty sandstone sandstone more sensitive,The sandy mudstoneThe mudstone is easy to soften after soaking
Sandstone (Sandstone) - a rock formed by the consolidation of sand and sediment through the water and deposited on the bed of the river for thousands of years. The sandstone structure is granular, the permeability is good, the sand particle size is 1/16-2mm, the particle is specially small, for example in the diameter 1/16-1/250mm is called the siltstone. The main components are: more than 52% of quartz composition; clay around 15%; goethite about 18%; other substances more than 10%. If the quartz content is above 90%, it is called quartz sandstone.
Shale (Shale) or rock (Mud) is a kind of clay, which is formed by compaction, dehydration and recrystallization. It is composed of micro minerals, the particle size is less than 1/256mm, with a sheet or thin bedding, with hard objects hit easily split into pieces, poor permeability. The difference between shale and mudstone shale is obviously flat bedding, adjacent two layers of particle size have the obvious difference, thickness less than 25cm thickness can reach tens of meters; shale bedding is not obvious, the monolayer thickness greater than 1 meters, and the texture is uniform.
