occurs in derives from has output output of formed as result of calcium carbonate water body sedimentary rock limestone https://en.wikipedia.org/wiki/Limestone A sedimentary rock which is composed primarily of calcium carbonate in the form of calcite or aragnoite. An interesting reasoning error was generated when this class had "composed primariy of some CHEBI:calcium carbonate". As that was a CHEBI:mineral, and minerals are disjoint from ENVO:rock, it led to an unsatisfiable class. The current axiom works around this, but this is requires some sort of geological convention to diffferentiate between masses of minerals and rocks that are composed primarily of minerals. EcoLexicon:limestone chemical precipitation process