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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 ?
This was done using petrography techniques, wherein we studied the rock and its contents under a microscope and did geochemical surveys.
Here scientists describe the evidence regarding geology and geoarchaeology, excavation and stratigraphy, pottery, chipped and ground stone tools, textile tools, marine animals, archaeobotanical remains, miscellaneous objects, pottery statistics, and ceramic petrography.
Paper or presentation topics might include advances in cement analysis or concrete petrography, or related case studies, plus challenges of emerging materials to cement analysis and concrete petrography.
Keywords: oil shale petrography, mineralogy, Maastrichtian, Attarat Um Ghudran deposit, Central Jordan.
This paper gives detailed petrography of the rocks, together with newly prepared geological maps.
The petrography, scanning electron microscope and X-ray diffractommeter were used for the detailed mineralogical investigations.
Keywords: Marble, Fretwork, Jahangir Tomb, Pakistan, Mineralogy, Petrography.
The field work was followed by a series of laboratory tests including direct shear testing for recovered soil samples, as well as chemical testing, soundness, Los Angeles Abrasion and petrography for the aggregate materials.
The authors here examine results from petrography and neutron activation on midden materials and briquettes of local raw materials at four different spatial scalar levels from households to microregion.
Petrography of thin sections of loess allow to document the character of individual Ck horizons.
From China, but also in Petrology subject, a paper presents geochemistry and petrography of the amphiboles and plagioclase from Fenghuangshan granodiorite.
HGI of coal is influenced by various factors including coal rank, composition and petrography, type and distribution of mineral matter particles and experimental conditions like temperature and pressure etc.