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The description and classification of rocks.

pe·trog′ra·pher n.
pet′ro·graph′ic (pĕt′rə-grăf′ĭk), pet′ro·graph′i·cal (-ĭ-kəl) adj.
pet′ro·graph′i·cal·ly adv.


(Geological Science) the branch of petrology concerned with the description and classification of rocks. Abbreviation: petrog
peˈtrographer n
petrographic, ˌpetroˈgraphical adj
ˌpetroˈgraphically adv


(pɪˈtrɒg rə fi)

the branch of petrology dealing with the description and classification of rocks, esp. by microscopic examination.
[1645–55; < New Latin petrographia. See petro-1, -graphy]
pe•trog′ra•pher, n.
pet•ro•graph•ic (ˌpɛ trəˈgræf ɪk) pet`ro•graph′i•cal, adj.
pet`ro•graph′i•cal•ly, adv.


the branch of geology that describes and classifies rocks, usually after microscopic study. Cf. lithology. — petrographer, n.petrographic, petrographical, adj.
See also: Geology


The description and classification of rocks.
References in periodicals archive ?
Mariano is a geological consultant specializing in rare earths and other rare metals, a seasoned mineralogist and petrographer, and is a recognized authority on REE mineralogy and deposits at a world level.
For many years he worked for the Geological Survey in Wales, and he was official petrographer to King George V.
David Kitson, consultant petrographer, seated, and Dr Barrie Wells analyse samples at Conwy Valley Systems headquarters at Llandudno Junction
During the summer of 1962 Sid worked for Anaconda as a petrographer in the Salt Lake City office, and returned to Michigan Tech in the fall.
Rongtang Liu is a materials engineer and concrete petrographer employed by SaLUT, Inc.
These changes in color can be simply be noted by a petrographer or they can be measured by photometric techniques.
CTLGroup Senior Petrographer Jean Randolph has been promoted to the Petrography Laboratory manager.