WordReference Random House Unabridged Dictionary of American English © 2015
pe•trog•ra•phy  (pi trogrə fē), 

    Rocksthe branch of petrology dealing with the description and classification of rocks, esp. by microscopic examination.
Etymology:1645–55; Neo-Latin petrographia. See petro-1, -graphy
pe•trogra•pher, n. 
pet•ro•graph•ic  (pe′trə grafik), 
pet′ro•graphi•cal, adj. 
pet′ro•graphi•cal•ly, adv. 

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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