What are chemical sedimentary rocks?

Answer 1

Sedimentary rocks can form when minerals in a body of water have so saturated the water that they precipitate out, like a cloud that is so full of moisture that it pours out rain. Some limestones are formed in this manner as the mineral calcite precipitates out of a saturated solution and undergoes the process of compaction and cementation. The supersaturated solutions can also be caused by evaporation of a body of water high in mineral content. As the water evaporates, the mineral percentage of the remaining solution becomes higher and higher, until the mineral crystallizes. Rocks such as rock salt and rock gypsum are formed in this manner. Sedimentation from precipitation and evaporation form rocks called chemical sedimentary rocks.

Answer 2

Chemical sedimentary rocks are formed from the accumulation of minerals that were dissolved in water and then precipitated out. Examples include limestone, dolomite, and chert. These rocks are often found in areas where there were ancient seas or lakes.