Allochem is a term introduced by Folk to describe the recognisable `grains` in carbonate rocks. Any fragment from around ½mm upwards in size may be considered an allochem. Examples would include ooids, peloids, oncolites, pellets, fossil or pre-existing carbonate fragments. Fragments are still termed allochems if they have undergone chemical tr.....
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http://en.wikipedia.org/wiki/Allochem
allochem Sediment formed by chemical or biochemical precipitation within a depositional basin; includes intraclasts, oolites, fossils, and pellets.
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http://www.wordinfo.info/words/index/info/view_unit/84/2
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