"undulose extinction Refer to each style’s convention regarding the best way to format page numbers and retrieval dates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites: http://www.chicagomanualofstyle.org/tools_citationguide.html. Therefore, that information is unavailable for most Encyclopedia.com content. 2013 Nov 28 - undulose extinction in quartz; Fig. A Dictionary of Earth Sciences. Recognizable in thin section by a more polygonized texture, the increased softening of the quartz allows for more thorough reduction of internal stresses. Most online reference entries and articles do not have page numbers. Then, copy and paste the text into your bibliography or works cited list. bird's eye extinction in mica ) that may inhibit this measure and may be more difficult to use. 2005. Instead, sub-domains of individual grains go extinct in slightly different positions, a feature known as “undulose extinction”, seen in the central grain of quartz in B. Quartz grains are typically anhedral in most rocks and, although quartz is uniaxial and should have parallel extinction, there is usually no hint of crystal form to use as a reference for measurement of extinction angle. This means that different parts of a crystal reach extinction at slightly different angles, giving the crystal an irregular, mottled look.[1]. 25% quartz. The matrix consists ofsericite, chlorite and abundant fine-grainedunidentifiable minerals. quartz) on rotation of the stage. Undulose extinction of quartz in Orthogneiss. Discover (and save!) Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Quick Reference. A Dictionary of Earth Sciences. your own Pins on Pinterest Often, quartz grains occur which show uneven or undulose extinction: the crystal does not all go into extinction in one position. Discover (and save!) Undulose extinction or undulatory extinction is a geological term referring to the type of extinction that occurs in certain minerals when examined in thin section under cross polarized light. undulose extinction. Undulose extinction is very common in quartz, so much so that it is often used as a diagnostic feature of that mineral, and feldspar of various sorts, but is possible in almost any mineral. As the microscope stage is rotated, individual mineral grains appear black when the polarization due to the mineral prevents any light from passing through. In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Undulose extinction or undulatory extinction is a geological term referring to the type of extinction that occurs in certain minerals when examined in thin section under cross polarized light. your own Pins on Pinterest Cite this article Pick a style below, and copy the text for your bibliography. However, some minerals acquire undulose extinction easily and even under the effect of minor or local deformations. A Dictionary of Earth Sciences. hepa…, ORIENTATION . & Trouw, R.A.J. Encyclopedia.com. undulose extinction In optical mineralogy, the irregular or wavy extinction seen in thin sections of mineral grains (e.g. Aug 7, 2018 - This Pin was discovered by Bryn Mawr College Mineralogy. ." Different parts of the grain go into extinction in different orientations. However, some minerals acquire undulose extinction easily and even under the effect of minor or local deformations. Symbols of space and its order most clearly illustrate the religious act of orientation, that is, the fundamental process of situating…, Undset, Sigrid (20 May 1882 – 10 June 1949), https://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/undulose-extinction.

what causes undulose extinction in quartz

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