Found inside – Page 38A few small aplite veins were encountered in the granite in a stream bed which crosses the northeastern extremity of the granite ... The reason for the difference between the average normative and average volumetric values for quartz must ... Found inside – Page 49The most significant chemical differences between Salem granite , quartz diorite , Khomas schist and red gneissic granite within this area ( see table 10 ) are seen by comparing the cation proportions in table 14. These comparisons are ... Found inside – Page 225Granite . Here is a piece of a rock , called granite ; you will perceive three distinct substances , which you will recognize to be quartz , mica , and ... Found inside – Page 82Paleozoic sedimentary and volcanic rocks occupy the area between the granite and quartz- porphyry masses. The porphyry ... Petrographical similarities between the different rocks suggest that they belong to one period of igneous activity. Found inside – Page 570GRANITE AND QUARTZ - DIORITE . Nearly all of the quartz - bearing granitoid rocks of the Bidwell Bar area may be correctly called quartz - mica - diorites ... Found inside – Page 26This migmatitic granite varies irregularly between fine- and coarse-grained and mesocratic to leucocratic, in which the mafic ... A coarse foliation is usually imparted to the rock by incipient elongation of porphyroblasts of feldspar, small accumulations of quartz, or patches of biotite. Much of the coarser-grained migmatitic granite is porphyroblastic, and all variations are so frequent that differences on a scale ... Found inside – Page 150Porosity of average Swedish granite shown for comparison ( Stenberg , 1986 ) . ... ( microdarcies ) 18 Granite Quartz monzonite Dolerite Altered rock Shallow ... Found inside – Page 57The difference between these two rocks , the granite being unstratified and the gneiss ... The quartz rock , which constitutes the western base of the Green ... Found inside – Page 20Granite, Gneiss, Acid Dykes, Quartz Reefs. There is no fundamental mineralogical difference between the main granite masses outcropping in the south-eastern and South-western corners of the area. The granite is a medium to coarse ... Found inside – Page 544Crystallization of rock - forming minerals after trapping causes the major differences between aqueous and melt ... zinc and lead vein deposit , we observed under the microscope that highly saline inclusions occur in the quartz of the granite . Found inside – Page 107eutectic away from quartz with increasing activity of water in the fluid . ... Depression of the granite minimum by the addition of sillimanite . Found inside – Page 41A true granite is composed of quartz , orthoclase , feldspar and two micas , biotite and muscovite . The micas are ... A striking difference between granite , diabase and diorite lies in the fact that the two last do not possess quartz . By reference ... Found inside – Page 758In the porphyritic granite variety in the size , distinctness , and ... and differences of composition of the mass . crystals of quartz ; and in other ... Found inside – Page 23The margins of these veins are diffuse The pink pegmatites , like the anastomosing and the difference between granite and ... of the granite . are set in a groundmass of strained quartz , The veins are identical with the granite when plagioclase ... Found inside – Page 57HORNBLENDE GRANITE QUARTZ MONZONITE The rocks in some of the smaller areas in the central and western parts of the quadrangle range from granite to quartz ... Found inside – Page 31... seems to confirm the existence of an age difference between the various diabases . The rock association of rapakivi granite , quartz porphyry dykes and diabases in the southwestern archipelago of Finland has been discussed by Sederholm ... Found inside – Page 82Paleozoic sedimentary and volcanic rocks occupy the area between the granite and quartz- porphyry masses. The porphyry ... Petrographical similarities between the different rocks suggest that they belong to one period of igneous activity. Found inside – Page 183... content of impurities (granite quartz 34-2/90) shows also the highest EPR intensities. The differences and the occurrence of [TiO4 -/Li+]0 between the ... Found inside – Page 10The been formed and as well as from some differences of structure . hard granites consist of quartz with a transparent ... giving the stone a dark cooled from its liquid condition granite was formed and is known color , as in the Quincy granite . This book reinvents the countertop with a single material: concrete. Found inside – Page 78Here and there in the property the conglomerate or greywacke is intruded by dykes , masses or sills of igneous rocks . These include granite , quartz syenite porphyry and Late Precambrian gabbro - diabase . The gold - bearing quartz veins ... Found inside – Page 41A true granite is composed of quartz , orthoclase , feldspar and two micas , biotite and muscovite . The micas are ... A striking difference between granite , diabase and diorite lies in the fact that the two last do not possess quartz . By reference ... Found inside – Page 275dike , differences which are mainly dependent upon the width of the dikes ... of a granite - porphyry , composed of quartz , mica , and orthoclase in ... Found inside – Page 449The reason of the difference between granite-porphyry and fine-grained porphyritic granite is probably that the various volatiles and active ... There are many micro-phenomena in quartz-porphyry which show the property of the mineralization. Found inside – Page 67In the granite normative quartz varies all the way from 24 to 40 percent ... rock type will necessarily underestimate the differences between types . Found inside – Page 231tains and in the Cottonwood , San Jacinto , and Santa Rosa mountains . ... sandstones , and quartzites of Cambrian age resting on a basement of granite . Found insideThis book is a printed edition of the Special Issue "Mineralogy of Quartz and Silica Minerals" that was published in Minerals Found inside – Page 141The Hudson and Chester Granite quarry is in the own of Becket , 1,400 feet above sea level , 64 miles southeast of Becket illage , in Berkshire County , Mass . ... quartz and feldspar are seen to lie in a somewhat micaceous matrix of very fine jexture , and there is not a little granulation about the feldspars . ... The only difference between the dark and light varieties is in the percentage of the black mica . Found inside – Page 154was not accompanied by any appreciable differentiation : no pegmatite veins and quartz veins are found in the granite , and ... The differences between the El ' dzhurta granite quartz and the quartz from the so - called leucocratic granitoids that ... Found inside – Page 16GRANITE AND APLITE Granite rare . 5 FEET FIGURE 4 .-- Granite dike cuteral in the quartz diorite . Decreasing quartz content of feldspar and quartz ... Found inside – Page 3Quartz .. Differential thermal analysis . Feldspar ... By difference . ... occur imbedded in the granitic ground mass , giving the granite a 8 Reference to ... Found inside – Page 449Petrographic differences between granite of Rosalie Pikes Peak in contrast to the older ... and the Yankee Creek pluton ( Silver Plume Quartz Monzonite ) . Found inside – Page 85Farther down toward the Oakdale House , this is replaced by coarse eruptive granites , Just below the Oakdale House there is a very interesting contact between granite , quartz porphyry , and diabase . The first rock exposed below the house ... Found inside – Page 7The mafic dikes contain fine - grained , equigranular plagioclase , quartz , clinopyroxene , hypersthene , hornblende ... The difference between the granite gneiss units and the unit of foliated granite is not always apparent , since facies of the ... Found inside – Page 541 in the scale fore taking up those composed of two or more . ... 2 may study quartz , feldspar and mica before studying granite . be scratched with a nail , No. 3 can be ... Compare the angles by pressing a Granulite ( Binary Granite ) ,. . Quartz ... Found inside – Page 29126 from a small band in the Kodonia River contains quartz , plagioclase , muscovite , sericite , epidote , hornblende ... Under the microscope there is little difference between this granite and many of the biotite gneisses , particularly the ... Found inside – Page 6Nevertheless , granite pebbles on the Gombak disAnother comparison between humid tropical and appear almost as quickly ... Similarly , granite pebbles decrease more rapidly in relation to quartz examining the values for various lithologies ... Found inside – Page F-10The Precambrian rocks are , from oldest to youngest , ( 1 ) granite gneiss ... and ( 4 ) interbedded amphibolite and quartz - muscovite schist ( unit płasp ) ... Found inside – Page 48However , there is a crucial difference between these two stones which makes them geologically distinct . The principal components in granite are quartz and ... Found inside – Page 103In fact , some of the quartz specimens examined contained between three and four times their own volume of CO2 if the latter were released to conditions of ... Found inside – Page 84Just below the Oakdale House there is a very interesting contact between granite , quartz porphyry , and diabase . The first rock exposed below the house is ... Found inside – Page 158Same , no spodumene ; 1st , albitic granite , little quartz and muscovite ... The old locality on Norwich Hill was opened for me in the summer of 1884 ... Found inside – Page 4Endomorphic in the granite . Endomorphic in the diorite . Exomorphic changes .. Rocks of the intruded sheets and dikes .. Aplitic granite ... Quartz ... Found inside – Page 155The exposure was in close proximity to a large Granite quartz - topaz vein in granite . ... to greisen are granite . encountered and frequently the greisen ( 4 ) The marked difference between the areas include unaltered masses of granite . quartz ... Found inside – Page 96There is also an unconformity between the Huronian and Laurentian . ... at the base of the series where it holds pebbles of granite , gneiss , and quartz . Found inside – Page 20The chief difference between biotite granites A and B in the modes is shown by a higher ( biotite + hornblende + chlorite ) content in granite A , and by a slightly higher average quartz content in granite B. A maximum of 7 per cent hornblende ... Found inside – Page 176electric potential difference or field associated with above charge distribution so that one can compare the model ... Assuming the quartz crystals in granite rocks are completely random , the number of orientated quartz grains would be n1 / 2 ... Found inside – Page 898Quartz veins , inclining to pegmatitic nature , also occur in the granite The placers contain bowlders , cobbles , and gravel of granite , granite porphyry ... Found inside – Page D-8The major difference is in the plagioclase , which averages about Anz in the ... percent ) of Silver Plume Granite Sample station Quartz K - feldspar ! Exposure was in close proximity to a large granite quartz - topaz vein in granite to a granite. 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