* Chemical precipitates: These rocks form when dissolved minerals in water become supersaturated and crystallize out of the solution. Examples include:
* Rock salt (halite): Formed by evaporation of seawater.
* Gypsum: Formed by evaporation of seawater or other saline solutions.
* Limestone (calcium carbonate): Can form through chemical precipitation, but also through biological processes.
* Chert (silicon dioxide): Formed from the accumulation of silica skeletons of microscopic organisms.
* Biochemical precipitates: These rocks form from the accumulation of organic materials, often the remains of organisms. Examples include:
* Limestone (calcium carbonate): Often formed from the accumulation of shells or skeletons of marine organisms.
* Coal: Formed from the accumulation of plant remains.
* Oil shale: Formed from the accumulation of algae and other organic matter.
Key difference from clastic sedimentary rocks:
Clastic sedimentary rocks are made up of fragments of pre-existing rocks (clasts) that have been transported and deposited. Non-clastic rocks, on the other hand, are formed by chemical or biological processes.
