The Ore Minerals Under the Microscope: An Optical Guide, Second Edition, is a very detailed color atlas for ore/opaque minerals (ore microscopy), with a main emphasis on name and synonyms, short descriptions, mineral groups, chemical ... Found inside – Page 156Plagioclase forms about one - third of the thin sections and orthoclase and quartz average one - quarter each . Biotite is the other primary mineral and forms one - eighth of the thin section . As with the Weberra Granite , granophyric rocks are ... Found inside – Page 125Studies of thin sections show some large , elongated quartzite pebbles in a fine - grained matrix of quartz , orthoclase , hornblende , and chlorite . Found insideRhyolite made of fine grained intergrowth of orthoclase & quartz . Sericite chlorite , calcite and magnetite are abundant , Thin section ... Found inside – Page 14Orthoclase . The orthoclase in nearly all thin sections examined has a strong tendency to assume an idiomorphic structure . The faces oP , P and poo are frequently quite well developed . It is not uncommon to find beautiful micropegmatite ... Found inside – Page 144In addition, small needle-like crystals of sillimanite, minute flakes of graphite and biotite and grains of quartz and orthoclase are discernible with the naked eye. In thin sections, under the microscope, the rock is found to also contain a few small ... Found inside – Page 44enclosed in orthoclase or quartz it forms euhedral prisms , but is very apt to build clusters of stout subhedral mutually ... was observed in one thin section ( 22809 ) and in the same section the interstitial orthoclase was occasionally perthitic . Found inside – Page 673A thin section shows much triclinic feldspar as well as orthoclase , a small amount of quartz , biotite and hornblende . Pirnie - Simpson , Foster . This 8-hour free course was to give practical experience with a polarising microscope, a key tool in the study of minerals and rocks. This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 edition. This book is aimed to provide solid foundation of Raman spectroscopy to the students, scientists, and engineers working in various fields as mentioned above. Found inside – Page 1393THIN SECTION 1619 CONE size 1636 THIN SECTION PINK AND GRAY RHYOLITE PORPHYRY : PHENOCRYSTS OF QUARTZ AND ORTHOCLASE ; GROUNDMASS OF INTEROROWN QUARTZ THIN SECTION AND ORTHOCLASE . Found inside – Page 195The alkali feldspar appears from thin - section study to range from orthoclase to intermediate microcline and no examples of maximum microcline have yet been found . Biotite and or hornblende occur in the granite , but the biotite is rarely as ... Found inside – Page iThis RILEM AAR 1.2 Atlas is complementary to the petrographic method described in RILEM AAR 1.1. It is designed and intended to assist in the identification of alkali-reactive rock types in concrete aggregate by thin-section petrography. Found inside – Page 223The section shows lenticles of felspar and quartz, which is frequently granulated, in a finer, granular matrix of sedimentary material, ... The minerals seen to be present in thin section are quartz, orthoclase, plagioclase, biotite, and hornblende, ... The Pennsylvanian Hartshorne Sandstone crops out in an east trending belt across central Arkansas immediately north of the Ouachita orogenic belt and south of the Boston Mountains. Found inside – Page 76Under the microscope the rock is seen to consist of larger crystals of quartz , plagioclase , and orthoclase with slender plates of biotite in a ... In thin section it resembles the Nipisiguit granite , consisting of orthoclase , quartz , albite , and biotite . Found inside – Page 320A thin section of one of the highly sheared rocks shows distinct fluxion structure . ... 50 per cent of the rock ax consist of ( 1 ) fine - grained aggregates of quarta and orthoclase , ( 2 ) altered plagioclase , probably andesine , or ( 3 ) orthoclase . Found inside – Page 107The orthoclase and microperthite generally form pink crystals up to an inch long. Rosiwal analyses on two thin sections indicated the following average composition: quartz, 28.5 per cent; orthoclase, microcline, and microperthite, 49.5 per cent; ... Found inside – Page 221A thin section shows short crystals of orthoclase in a coarse groundmass of lath - shaped orthoclase and plagioclase . Some augite is present , and also grains of magnetite and pyrite . A few rounded boulders of similar rock , containing visible ... Found insideThis new edition emphasizes the relationship between rocks and minerals, right from the structures created during rock formation through the economics of mineral deposits. Found inside – Page 326Thin sections under the microscope show , in the approximate order of abundance , microcline , quartz , orthoclase , oligoclase , biotite , muscovite , apatite , magnetite , titanite , and garnet . A few grains of apatite are found in every thin section ... This is a fascinating work and is thoroughly recommended for anyone interested in geology. Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce. Found inside – Page 167In thin section only occasional small phenocrysts of orthoclase are visible . The groundmass , which consists largely of orthoclase and quartz , is extremely fine . A little epidote and chlorite are present in it . Dikes of intermediate and basic ... Found inside – Page 37In thin section the tinguaites have euhedral nepheline and orthoclase phenocrysts about 1 - 2 mm . long in a matrix of elongate augite and orthoclase laths about 0 . 1 mm . in length . Augite and orthoclase occur in approximately equal ... Found inside – Page 19Thin - section examination of the rocks reveals many characteristics that are common ... Orthoclase , much of it perthitic , is commonly interstitial or is ... Found inside – Page 53Careful examination always reveals large fresh orthoclase phenocrysts in areas of biotiteorthoclase porphyry . Veinlets of secondary orthoclase , sometimes identifiable only in thin section or with X - ray diffraction , are common 1 . in some ... Found inside – Page 29The rock appears more prominently porphyritic when viewed in thin section and shows a scattering of small orthoclase , quartz , and oligoclase phenocrysts in a microgranular groundmass of orthoclase and quartz , with small zircon and ... Found inside – Page 50In thin section , up to 10 % granophyric Intergrowth of quarts and orthoclase was noted . The base of the overlying Apache basalt contains epidotecalcite alteration , but toward the top , it is permeated by small stringers , irregular splotches and ... Found inside – Page 37In thin section it is seen to be composed mainly of orthoclase and quartz with smaller amounts of microcline and plagioclase . Some of the orthoclase is partly altered to sericite . Green biotite is the ferromagnesian mineral and contains zircon ... Found inside – Page 71The texture of the rock seen in thin section is intergranular . • The grain - size is ... It is very coarsegrained , with a few porphyritic phenocrysts of pink orthoclase . The thin section reveals a medium grained granitic rock . The rock consists of ... Found inside – Page 35are rare . clase , pink orthoclase , thinly scattered quartz , a few and is ... In one thin section from the southernmost clusions similar to those in the ... Found inside – Page 103... quartz - orthoclase - plagioclase - sillimanite - garnet - cordierite ( Field , 1975 ) and thus are of somewhat higher metamorphic grade than the western - most rocks in the Barre area . Garnet and cordierite were found in the same thin section ... This is a fascinating work and is thoroughly recommended for anyone interested in geology. Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce. Found inside – Page 63In the thin sections studied , these medit to coarse - grained gneisses consist of zoned plagioclase ( oligoclase - albite ) , orthoclase ( perthite ) , quartz , biotite . Plagioclase are saussuritised and frequently replaced by K - feldspar and quartz . Found inside – Page 415Orthoclase may be distinguished from sanidine and anorthoclase by larger ... of techniques for staining potassium feldspar in thin section so that it may be ... Found inside – Page 26Altered alkalic trachyte ( table 16 ) . but in some subhedral orthoclase laths lie with the long dimenIn thin section aggregates of pale - brown biotite and ... Found inside – Page 40Eastern facies , average of 5 thin sections . across . tain quadrangle . ... essentially parallel to the northeastward - trending Orthoclase 19 contact with ... Found inside – Page 40Examination in thin section showed a felted mass of cristobalite crystallites . With a ... phenocrysts of orthoclase set in a porphyroblastic ground mass , consisting of irregular grains composed of oriented aggregates of quartz and orthoclase . Found inside – Page 115In thin section the laminations , about . ... In thin section typical hypidiomorphic texture is shown . ... adhedral quartz with undulose extinction and largely sericitised orthoclase , irregular plates and prisms and ragged aggregates of biotite and ... Found inside – Page 28In most thin sections the recrystallized orthoclase contains sericite , which is distributed through the rock as small flakes and rosettes . Found inside – Page 330An culise inclusion in orthoclase . Thin section 132 , X 38 , crossed nicols . FIGURE 90. Inclusion of fayalite , magnetite , and clinopyroxene in quartz . Thin section 7g . x 36 , parallel nicols . FIGURE 31. Zonal structure of orthoclase ( zonality ... The book will provide an invaluable guide to all undergraduate earth scientists, as well as to professional geologists requiring an overview of mineral identification in thin section. Methods of optical mineralogy; Descriptions of minerals; Mineral identification tables; Petrography of igneous tocks and related; Volcanic and hypabyssal socks-basalts, dia-bases, and related rocks; Andesites, dacites, and related rocks; ... Design fro students to have a hand in the labratory." --Back cover. This is the second edition of a concise, straightforward, and balanced presentation of the theory and techniques of optical mineralogy. Trachyte ( table 16 ) download a free scanned copy of the earliest books, particularly those dating to. Clinopyroxene in quartz books, particularly those dating back to the northeastward - trending orthoclase 19 contact...! Page 40Examination in thin section or with X - ray diffraction, are common 1 to sericite with... inside... Give practical experience with a polarising microscope, a key tool in the study of minerals and.... Coarsegrained, with a few porphyritic phenocrysts of orthoclase and microperthite generally pink... 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