Webster's English Dictionary

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concretion

con.cre.tion \ka:n-'kre--sh*n, k*n-\ \-sh*-.ner-e-\ n 1: the act or process 
   of concreting : the state of being concreted @ of ideas in an hypothesis} 
   2: something concreted : as  2a: a hard usu. inorganic mass (as a bezoar or 
   tophus) formed in a living b ody 2b: a mass of mineral matter found 
   generally in rock of a composition diffe rent from its own and produced by 
   deposition from aqueous solution in the rock - con.cre.tion.ary aj