(of a constituent of a rock) formed in the rock where it is found.Compare allogenic(def 1).
Origin of authigenic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
(of minerals) having crystallized in a sediment during or after deposition
Word Origin for authigenic
C19: from German authigene from Greek authigenēs native + -ic
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012