adjective Geology.
(of a constituent of a rock) formed in the rock where it is found. Compare allogenic ( def 1 ).

1885–90; < German Authigen < Greek authigenḗs native to a specific place (aûthi there + -genēs born) + -ic; see genic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
authigenic (ˌɔːθɪˈdʒɛnɪk)
(of minerals) having crystallized in a sediment during or after deposition
[C19: from German authigene from Greek authigenēs native + -ic]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
These authigenic minerals provide a record of the prevailing environmental and
  hydrologic conditions at the time of deposition.
These deposits were created in the past and are thought to result from the
  precipitation of authigenic carbonates.
The samples in a and c are well-preserved and contain no authigenic minerals.
Any practice recommended to reduce suspended sediment in these waters must take
  authigenic precipitates into consideration.
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