American Heritage® Dictionary of the English Language, Fourth Edition
- n. The description and classification of rocks.
Century Dictionary and Cyclopedia
- n. The art of writing or inscribing on stone.
- n. The study of rocks; lithology; petrology. The investigation of the minerals of which rocks are made up is called
lithology, which includes not only the determination of the mineral constituents of a rock. but also the study of the changes which these constituent minerals have undergone, either during the consolidation of the rock or at a subsequent period, in the course of those changes which are denominated metamorphic (see metamorphism) —changes often complicated and difficult to decipher. While in some rocks the constituents are crystallized in large and distinctly formed individuals, so that each species can be separated and analyzed by itself without difficulty, this is ordinarily not the case. Hence by the methods formerly pursued it was often extremely difficult, if not impossible, to make out clearly of what species the rock was composed. At the present time the method of examination of a rock consists in cutting from it one or more sections sufficiently thin to be nearly transparent; these are examined with the microscope, with and without the use of polarized light; and the optical and crystallographic appearances presented are generally sufficient to give not only a correct idea of the nature of the minerals, but also of the changes which they have undergone through various stages of metamorphism. Assistance is also afforded by the method of separation in which gravity-solutions are employed. (See gravity-solution.) While most geologists writing in English use the terms lithology, petrology, and petrography as nearly synonymous, others desire to limit the meaning of the first of these to the indoor or laboratory study of rocks, and would define petrography as including their investigation both indoors and in the field.
- n. petrology the branch of petrology that deals with the scientific description and classification of rocks
- n. The art of writing on stone.
GNU Webster's 1913
- n. The art of writing on stone.
- n. The scientific description of rocks; that department of science which investigates the constitution of rocks; petrology.
“As the BBC reports, Robert Ixer of the University of Leicester and Richard Bevins of the National Museum of Wales pinpointed the source to within 230 feet and did so by "detailing the mineral content and the textural relationships within the rock, a process known as petrography.”
“By detailing the mineral content and the textural relationships within the rock, a process known as petrography, they found that 99% of the samples could be matched to rocks found in this particular set of outcrops.”
“The geomorphology of the area reflects its geological constitution, in particular its petrography and tectonic structure.”
“Geology, petrography, and geochemistry of the volcanic islands of Tonga.”
“Oh, that one's a P.Geo - a professional geologist - is can log drill holes, update and construct geological models, they are experts in igneous and metamorphic petrology and petrography, hydrogeology, sedimentolgoy and structural geology.”
“These are splendid specimens that give us a peek at some awesomely fragile organisms, and modern technology helps by giving us new tools, like x-ray computed tomography (CT), scanning electron microscopy (SEM), thin-section petrography, synchrotron X-ray tomographic microscopy (SRXTM), and computer-aided visualization, that allow us to dig into the fine detail inside these delicate specimens and display and manipulate the data.”
“These sample will be analyzed mineralogically (petrography, X-ray diffraction) and geochemically (Inductively Coupled Plasma-Mass Spectrometry, X-Ray Fluorescence) to identify and characterize the ore deposits and the metal production waste.”
“Business has been a bit slow, of course, what with the weather, but I've been keeping my hopes up that fine gentlemen like yourselves would need professional assistance with matters in geology, petrography, mineralogy, or even gemology, such as it may be, and I graduated first among my guild in mine engineering and geology, with a secondary degree in mechanics ....”
“To the graduates were assigned courses in advanced geology, mineralogy, petrography, advanced economic geology, and the economic geology of the Southern Appalachians.”
“Professor T.L. Watson, the new incumbent of the chair of geology, delivered a series of specialized lectures, — accompanied by laboratory and field work, — on engineering geology, economic geology, and petrography; and in 1908 – 09, Professor R.M. Bird, of the chemical faculty, gave instruction in chemical engineering.”
These user-created lists contain the word ‘petrography’.
of or relating to rock; relating to petroleum
Looking for tweets for petrography.