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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.
References in periodicals archive ?
She brings extensive experience evaluating geological and building materials using polarized-light microscopy and other petrographic methods; scanning electron microscopy with x-ray spectroscopy; electron microprobe analysis; x-ray fluorescence or diffraction; plus, physical and chemical testing methods.
Replacement of details will require new stone to match existing which will require sample testing and petrographic analysis of existing stonework.
On the basis of petrographic investigations of rocks enriched with total organic carbon (TOC) (up to 2.
The petrographic results indicate that the sandstones of Manchar Formation on QFL diagram are mostly quartz arenite and a few units are sub-arkose to sub-litharenite.
Sample preparation and observation of petrographic study were completed at Advance laboratory of centre for pure and applied Geology, University of Sindh, Jamshoro.
These samples were studied by optical microscopy and X-ray diffraction for petrographic and mineralogical characterization and for understanding the manufacturing process/ technique.
Direct search for reactive forms of silica by petrographic methods (Sims and Nixon 2003) combined with expansion of experimental mortar bars or concrete prisms subjected to ASR accelerating conditions (Berube et al.
Twenty chapters are: IddingsAE petrographic education; assistant geologist with USGS-I; assistant geologist with USGS-II; Yellowstone country-I; Yellowstone country-II; igneous rock classification and differentiation; Europe and Chicago; rethinking igneous rock classification; a second trip to Europe; the Seventh International Geological Congress; the quantitative igneous rock classification; reception of the classification and new challenges; major publications; journey to the Orient: Japan; journey to the Orient: Korea and China; journey to the Orient: The Philippines and Japan; journey to the Orient: the East Indies; Igneous Rocks II; problems; return to the East Indies.
To confirm this fact from a petrographic point of view we have selected 6 samples (named N-4.
Native gold was also identified for the first time in drill core during recently completed petrographic work.
The interpretation of a possible impact origin for the Bloody Creek structure in Nova Scotia was based on an integrated analysis of geomorphic, geophysical, and petrographic data (Stevens 1995; Spooner et al.