The difference between shale and sandstone
The sandstone is formed by clastic sediments, and biological sedimentary formation such as coal, and chemical deposition to form such as gypsum, Jasper, clastic rock or some other can be mineral crystals, cemented the fragments may calcite, clay or silica, clastic particle size between 0.1 to 2 mm, the particle size is too small will the formation of schist or shale, the formation of conglomerate or breccia.The formation of iron oxide stripe sandstone sandstone is divided into two stages, the first sand layer by layer deposition, may be caused by water or air handling; then under pressure from above by leaching of calcium carbonate or siliceous cement together, which contains iron, silicon, manganese and other elements will cause the color different sandstone. Due to the difference of sedimentary environment, all kinds of sandstones have different joints, grain size, color and properties, and are mainly composed of two types: continental deposit and marine deposit.
Shale was formed in lentic environment, sediment deposition after a long time, so often exist in the lake and river deltas, formed in the continental shelf is shale, shale often contains ancient fossil plants and animals. Sometimes there are traces of animal fossils, and even ancient traces of rain may be preserved in the shale
Shale is a sedimentary rock, complex composition, but having a thin sheet or sheet laminated joints is mainly formed by clay deposited by the pressure and temperature of rock, but mixed with detrital quartz, feldspar and other chemical substances, according to its mixed composition, can be divided into:Calcareous shale, iron shale, siliceous shale, carbonaceous shale, black shale, oil shale shale which may be iron ore, oil shale can be refined oil, [2] oil can be used as the indicator of black shale formation.
