WordReference Random House Unabridged Dictionary of American English © 2017
pe•trog•ra•phy  (pi trogrə fē),USA pronunciation n. 
  1. Rocksthe branch of petrology dealing with the description and classification of rocks, esp. by microscopic examination.
pe•trogra•pher, n. 
pet•ro•graph•ic  (pe′trə grafik),USA pronunciation  pet′ro•graphi•cal, adj.  pet′ro•graphi•cal•ly, adv. 
  • Neo-Latin petrographia. See petro-1, -graphy
  • 1645–55;

Collins Concise English Dictionary © HarperCollins Publishers::

petrography /pɛˈtrɒɡrəfɪ/ n
  1. the branch of petrology concerned with the description and classification of rocks
    Abbreviation: petrog

peˈtrographer n petrographic /ˌpɛtrəˈɡræfɪk/, ˌpetroˈgraphical adj

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