Is coal organic chemical or clastic?

Clastic sedimentary rocks such as breccia, conglomerate, sandstone, siltstone, and shale are formed from mechanical weathering debris. Chemical sedimentary rocks, such as rock salt, iron ore, chert, flint, some dolomites, and some limestones, form when dissolved materials precipitate from solution. read more

They can be divided into three types: clastic, organic, and chemical. Clastic sedimentary rocks are rocks that form from broken pieces of other rocks. Organic sedimentary rocks are formed from the remains of once living creatures and plants. read more

These groups are detrital, biogenic, and chemical; within biogenic, there are two sediment classifications, organic and bioclastic. Detrital rock, also called clastic, is formed by the accumulation of sediment from preexisting rocks and minerals, using mechanical weathering and transportation by mechanical agents such as wind, water, ice, and gravity. read more