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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 ?
The North structure and the Bloody Creek structure are morphometrically, geophysically, and petrographically similar.
Second, they indicate the existence of macroscopically similar but petrographically different white inclusions in a limited number of fabrics.
Six soil profiles from four petrographically different areas in south-west Germany, a region characterised by a humid-temperate climate, were selected for the first runs of the new sequential extraction procedure, both to evaluate the method and to quantify the different Si-pools in the soil profiles.
Petrographically and geochemically the dolostones of the Plavinas RS differ significantly from Early-Middle Devonian early diagenetic dolostones (Kleesment & Shogenova 2005; Kleesment 2007; Shogenova et al.
Black shale in Egypt was also studied petrographically, mineralogically and geochemically by many workers [11, 14-16].
Rare black and crenulated kernels from 1mm to 3mm maximum dimension, incorporated within several crenulations of the schistose micas are petrographically identified as being "carbonaceous", being composed of compact ultrafine graphite, individual flake size
86]Sr); they are therefore unlike adjacent West Valley lavas, both petrographically and chemically.
While it has been demonstrated petrographically that transformation of some of the primary labile minerals and rock-fragments to smectite is contemporary (i.
The samples were also studied petrographically, and identified as sovites (calcitic carbonatites) and beforsites (dolomitic carbonatites) containing pyrochlore and columbite.
is rated petrographically as high diamond interest.
The anorogenic Riga pluton that forms the southern part of the Riga-Aland rapakivi subprovince (Puura & Floden 1999) contains both mafic and silicic rocks, which are petrographically and geochemically analogous to the typical members of the Fennoscandian rapakivi-anorthositic suite.
It is to be recalled that it was not possible to distinguish separate flows for Unit F, either petrographically or in the field.