Manual of optical mineralogy, david shelley, 1975, science, 239 pages. As indicated by the table, the most useful optical properties for identifying most minerals are optical class and refractive index. Many metamorphosed and weathered basalts contain fresh clinopyroxene crystals set in an altered groundmass. In gabbroic anorthosites, it is palegreen in colour and feebly pleochroic from colourless to light green with the following optical. Its stability across diverse pressuretemperaturecomposition ptx conditions derives from its ability to incorporate a large range of cations in both octahedral and tetrahedral coordination states morimoto et al. These dacites are dominated by elongate microphenocrysts of ferroaugite and oxides set in a glassy matrix.
Usually colourless, gray, pale green or pale brown, darker colours associated with ferich varieties titanaugite is more distinctly coloured from brownpink to violet. The mineralogy has more scientific branches such as the following. Revised chapters on optical theory discuss the petrographic microscope, the nature and properties of light, the behavior of light in. The minerals represent those covered in optical mineralogy ersc 2p22 with the remainder being introduced in igneous and metamorphic petrology ersc 3p21. Both olivine and pyroxene show granoblastic mosaic textures composed of. This webpage provides a compilation of online instructional resources and teaching activities related to optical mineralogy and petrography. Origin of elements and compositionstructure of the earth lecture notes figures. He first joined brock in 1985 as a lecturer in geological sciences, and after completing his phd at. Nov 05, 2009 sodic clinopyroxene omphacite in plane polarized and cross polarized light, showing inclined extinction extinction when cleavage planes are inclined with respect to the crosshairs. Introduction to optical mineralogy william nesse oxford. Spatially controlled examination of these clinopyroxenebearing episyenites and their altered granitic margins allows us to model the geochemical mass transfer processes and mineralogical evolution of these rocks to understand the genesis of the hightemperature episyenites in atype granite complexes. More crystalline zones have intersertal glass that has. A optical photo of pigeonite exsolving from augite, b a drawing of the photograph.
Mineralogy and optical mineralogy is available in print as a full color paperback, in electronic form pdf as both the complete text and as individual chapters, as well as individual chapters for ipad and mac on ibooks. Crdiopside clinopyroxene as a kimberlite indicator mineral for. Optical mineralogy tutorial 3 free download as powerpoint presentation. Introduction to optical mineralogy by william d nesse alibris. Introduction to optical mineralogy, 2009, 348 pages. Midinfrared optical constants of clinopyroxene and. Quality control procedures commonly include spiking of samples with marker grains andor the reexamination of some samples, depending on the background mineralogy and difficulty.
Guide to thin section microscopy optical properties. Sep 15, 2010 these images show exsolution features in clinopyroxene. Pigeonite i forms by exsolution at high t, while pigeonite ii and pigeonite iii form at successively lower t. These images show exsolution features in clinopyroxene. A thin sliver of rock is cut from the sample with a diamond saw and ground optically flat. Clinopyroxeneliquid equilibria and geothermobarometry in. Nesse continues his detailed discussions of the petrographic microscope, the nature and properties of light, and the behavior of light in isotropic and anisotropic minerals, with detailed coverage of. Midinfrared optical constants of clinopyroxene and orthoclase derived from oriented singlecrystal reflectance spectra jessica a. In orthopyroxenes the m2 site is usually octahedral and commonly contains fe. Augite could be considered to be a subcalcic member of the diopsidehedenbergite series but, as defined by morimoto et al. A description of this technique can be found in most optical mineralogy textbooks. Clinopyroxene episyenites in a proterozoic rapakivi granite. Crdiopside clinopyroxene as a kimberlite indicator. Mineral chemistry of clinopyroxene and feldspars in the neoproterozoic alkaline dykes of the bangalore district, karnataka, india.
Nesse has done a masterful job creating what i think is hands down the best reference for optical characteristics. Pigeonite forms lamellae in an augite host crystal. Introduction to mineralogy, third edition, combines incredibly helpful optical data on minerals with the classic information of a mineralogy textbook. This is an ideal textbook for both advanced undergraduates and graduate students. Optical mineralogy pleochroism parallel extinction. Photomicrograph of orthopyroxene low birefringence, skinny lamellae surrounded by clinopyroxene higer birefringence, coarse lamellae. Pdf mineral chemistry of clinopyroxene and feldspars in. Nelson inosilicates pyroxenes and amphiboles inosilicates single chain silicates the single chain silicates have a basic structural unit consisting of linked sio4 tetrahedra that each share 2 of their. The above optical properties indicate that the clinopyroxene belongs to diopsidehedenbergite series. Jings senior year thesis introduction to mineralogy science education video songs by local musicians. Calderas and central volcanoes are outlined with solid and dashed lines respectively. Indicatrix gives us a way to relate optical phenomena to.
Introduction to optical mineralogy download ebook pdf. If you have not had the benefit of optical mineralogy before, or you are now finding yourself in the daunting position of trying to teach it to a new generation of longsuffering students, you probably want to find a new optical mineralogy textbook. This site is like a library, use search box in the widget to get ebook that you want. The molar cral in clinopyroxene is nearly identical to that of the bulk rock and correlates positively with the level of depletion. Plonka1 1department of geosciences, stony brook university, stony brook, new york 11794, u. Read introduction to optical mineralogy online, read in mobile or kindle.
Precambrian geologist by training, now working in administration, outreach activities and science education. Weis1,2, roland stalder3, and henrik skogby1 1department of geosciences, swedish museum of natural history, box 50007, se10405 stockholm, sweden. In orthopyroxenes the m2 site is usually octahedral and commonly contains fe and mg. Clinopyroxene mineralogy of ophiolitic ankaramites kiyoaki niida earth and planetary sci. Greg finn became viceprovost and associate vicepresident, academic in september 2007. We also calculate the optical constants of orthoclase. Oct 29, 2009 volcanic orthopyroxene in planepolarized and crosspolarized light, showing subtle pinkgreen pleochroism planepolarized light and parallel extinction c. Clinopyroxene geobarometry of pyroxenitic xenoliths from. The most widespread members include aegirine, augite, hedenbergite and diopside.
Mineralogy is the systematic study that deals with the characteristics of minerals. Other distinctions include body color in plainpolarized light ppl and birefringence, though the distinctions between cpx and ol are often not great. He first joined brock in 1985 as a lecturer in geological sciences, and after completing his phd at memorial university in 1989 was appointed. It contains valuable coverage of the optical properties of minerals, as well as uptodate descriptions of common rockforming minerals. Statistical discrimination of clinopyroxenes from known magma types provides a test of the effectiveness of this method, showing that any attempt to classify an unknown clinopyroxene as. Experimental hydration of natural volcanic clinopyroxene. The chains, which extend indefinitely parallel to the ccrystallographic axis, have the. Calcite amphibole clinopyroxene rock from the afrikanda complex, kola peninsula, russia. Nelson inosilicates pyroxenes and amphiboles inosilicates single chain silicates the single chain silicates have a basic structural unit consisting of linked sio4 tetrahedra that each share 2 of their oxygens in such a way as to build long chains of sio4. Spatially controlled examination of these clinopyroxene bearing episyenites and their altered granitic margins allows us to model the geochemical mass transfer processes and mineralogical evolution of these rocks to understand the genesis of the hightemperature episyenites in atype granite complexes. Clinopyroxene is a key constituent of many mantle, igneous and metamorphic rocks. It describes in detail more that 125 rockforming minerals and a selection of common ore minerals. Optical mineralogy in a nutshell use of the petrographic microscope in three easy lessons part ii. Dlingan department of geological sciences, southern methodist university, dallas, texas 75275, u.
In the cafemg diopsidehedenbergiteaugite quadrilateral, the ideal structural formula is m2m1si 2 o 6, where m2 is a distorted octahedral site which preferentially accepts large cations such as alkaline earthalkali atoms ca, but may accept transition metals and where m1 is a smaller regular octahedral site preferentially accepting transition. Select one of the minerals listed below to get a summary of the optical data and view representative plane light and crossed polar images. Clinopyroxene episyenites in a proterozoic rapakivi. Optical mineralogytutorials and other online resources.
Crdiopside clinopyroxene as a kimberlite indicator mineral. Slides borrowedadapted from jane selverstone university of new mexico and john winter whitman college. Download introduction to optical mineralogy ebook free in pdf and epub format. Introduction to optical mineralogy provides comprehensive coverage of the optical properties of minerals. Optical mineralogy clinopyroxene inclined extinction youtube. By comparison, augitic clinopyroxene cpx is biaxial positive with a moderate 2v angle. Pigeonite i forms by exsolution at high t, while pigeonite ii and pigeonite iii. Quartz, stishovite, silica glass, kyanite, omphacite, garnet, sanidine, muscovite, talc, rutile, dolomite. Minerals in thin section, dexter perkins and kevin r. Sodic clinopyroxene omphacite in plane polarized and cross polarized light, showing inclined extinction extinction when cleavage planes are inclined with respect to the crosshairs.
Buy introduction to optical mineralogy by william d nesse online at alibris. The essential feature of all pyroxene structures is the linkage of the siliconoxygen sio4 tetrahedrons by sharing two of the four corners to form continuous chains. Experimental hydration of natural volcanic clinopyroxene phenocrysts under hydrothermal pressures 0. Because of the way augite has been defined morimoto et al, 1988, there is the implication that in rare cases, a variety of anions may be dominant in various the. Alma31 is mainly composed of olivine, but small amounts of pyroxene 5 vol. The names of the common calciumironmagnesium pyroxenes are defined in the pyroxene quadrilateral shown in figure 2. Introduction to optical mineralogy better world books.
Click download or read online button to get introduction to optical mineralogy book now. Map showing the location of the 20142015 holuhraun lava in central iceland. The rock illustrated in these images contains both clinopyroxene and orthopyroxene, and the significantly higher cr 2 o 3 content of the clinopyroxene in this sample gives it a pale green colour in plane polarized light, whereas the crpoor orthopyroxene is colourless a. Clinopyroxene composition in mafic lavas from different. The fourth edition of introduction to optical mineralogy has been thoroughly revised and updated to increase reading comprehension and improve the clarity of its illustrations. A subgroup name for monoclinic pyroxene group minerals. Microprobe analysis of these relict grains can be used to identify the magma type of the host lava. In optical mineralogy and petrography, a thin section or petrographic thin section is a laboratory preparation of a rock, mineral, soil, pottery, bones, or even metal sample for use with a polarizing petrographic microscope, electron microscope and electron microprobe. A diagnostic feature of members of the pyroxene group is the 110 cleavage that. Mineralogy and optical mineralogy mineralogical society of. Enstatite mg2si2o6 c 2001 mineral data publishing, version 1. Introduction to optical mineralogy and petrography the practical methods of identifying minerals. Pdf introduction to optical mineralogy download ebook.
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