Composition of coal, sandstone shale
The sandstone is a sedimentary rock in clastic rocks, formed mainly by the grain handling magmatite or metamorphic rocks weathering after deposition, the main component from the view of the world dominated by quartz, followed by feldspar, lithic again, a little dark mineral, specific to the case of the difference, but mainly quartz feldspar lithic three categories.
These three types can be regarded as sedimentary rocks, in which the coal is formed after the burial of the higher plants;
The original rock shale is a sedimentary rock in the argillaceous rocks, is the main component of clay minerals, the pressure and temperature after transformation to form a thin sheet or thin bedded foliation, named shale.
