 | | Journal (article/letter/editorial) | | rhyolites from the Macedo de Cavaleiros region (NE Portugal) By M. LuIsA RIBEIRO, Lisboa*) With 13 figures...geochemistry of Variscan peralkaline gneisses from NE Portugal, discovered in 1962, is presented. Major and trace...Serviqos Geol6gicos de Portugal, R. Academia Ci~ncias, 19, 1200 Lisboa, Portugal. which they are overlain...des gneiss varisques peralcalins du nord-est du Portugal, d~couverts en 1962. Les analyses des 616ments...and HLAWASTSCH(1906) in the Cevadais area (SE Portugal). Meanwhile, many other articles have been published |  | | Journal (article/letter/editorial) | | the rock, later named pedrosite, from Alter-Pedroso, Portugal. Unfortunately, no analysis is given. Baker...(V. DE), 1904--7. Comm. Commissao Serv. Geol. Portugal, vol. 6, p. 178. [Manuscript received 6 June... to occur in bands. The predominant mineral is albite, forming a mosaic of small grains. Interspersed |  | | Journal (article/letter/editorial) | | feldspathfreies Endglied der Alkalireihe von Alter Pedroso," Sitzb. Heidelberger Akad. Wiss., Math.-naturw...occurring in a light-colored alkali-syenite in Portugal. The rock consists entirely of amphibole (osannite)...the angle ooI-oio with increasing temperature. Albite shows the greatest change, anorthite the least...those which do not appear in association with free silica. Among the former are orthoclase, albite, anorthite...systems. A new dike-rock, consisting essentially of albite and augite with titanite, magnetite, and apatite |  | | Journal (article/letter/editorial) | | the type osannite from pegmatites from Alter Pedroso, Portugal, named by HLAWATSCH (1906) for its distinctive...of composition. The clearly merit more study, as do the members of the magnesioriebeckite-crossite-ferroglaucophane...g . 1 w h i c h do n o t fall e x a c t l y o n t h e d i a g o n a l s w o u l d do so if t h e a n...determined, and 0.72% Ca present as calcite; No. 8, I% albite. These and remaining samples contain impurities...respectively. I t is likely that fl and y indices do in fact intersect within the diagram (Fig. 4) and |  | | Journal (article/letter/editorial) | | acmite-hedenbergite-diopside system recently proposed byAoki do exist under some igneous conditions. When natural...microperthite, surrounded by a clear mantle of albite, and the alkali pyroxene in question, associatedwith...92;Fe2Oa,4.60--->12.75. tions of these pyroxenes do not add up to the bulk analysis is ascribed mainly...composition lies within the proposed immiscibility region do exist under some igneous conditions. OccunnBNcB ol...Greenland (Washington and Merwin, 1927); Alter Pedroso, Portugal (Burri, 1928); Assynt, Africa (Sabine, |  | | Journal (volume) | | position an a log u e ace 11 e deR co nglomerats do Suursaari-Hogland 2 ,3 , 4. car Ra (;omposition a...Süll~kHJlel i Finland. 21 vom paläozoischem Alter cler Schiefer- und Grünsteinformationen der Petsamontunturit...werden. Die tektonisch wichtige Frage nach elen Alter;.;vcrhältnissen ...an altitude of ab out 230 m, but real eRker ridges do not oeeur. At the bottom of the valley whieh Reparatc...ice. Another notable fact is that erosion valleys do not occur in the esker gravel field :,urrounding |  | | Journal (article/letter/editorial) | | consisting of prehnite+calcite+ Fe epidote±quartz±albite±chlorite±clinozoisite±pectolite. The vein mineral...ultramafics nor amphibolites cover so large an area as they do in the Krivaja-Konjuh massif. Finally, ultramafics...predominantly twinned according to the complex albite-esterel law. However, grains are frequently deformed...Amphibolen. I. Mitteilung: Die Osannite von Alter Pedroso. Schweiz. Miner. Petrogr. Mitt. 11, 140-62. |  | | Book | | magma has taken place so that crystallites (which do not react to polarised light), in the form of tiny...basic lavas, cooling at approximately the same rate, do not normally show it because of their lower viscosity...are very fine grained to glassy. Some petrologists do not attach much importance to this three-fold division...salic, including quartz (qz), orthoclase (or), albite (ab), anorthite 14 Igneous rocks {an), nepheline...of the weight percentages of normative quartz + albite + nepheline + leucite + kalsilite, and indicates |  | | Journal (article/letter/editorial) | | The thin veins composed of ægirine-felt, acmite, albite and/or analcimenatrolite 1. The green veins 2....black, lujavrite·like rock, felted ægirine and albite-analcime-natrolite rocks; the head of Kangerdluarssuk...area is cut by thin veins of ægirine felt, acmite, albite and analcime·natrolite. The lujavrite here has...one or more of the minerals acmite, arfvedsonite, albite, analcime and natrolite. In the lujavrite a very...very pure maximum microc1ine and a pure low albite have been formed in equilibrium indicating a low temperature |  | | Journal (issue) | | The thin veins composed of ægirine-felt, acmite, albite and/or analcimenatrolite . . .. .. . . ..........black, lujavrite-like rock, felted ægirine and albite-analcime-natrolite rocks; the head of Kangerdluarssuk...area is cut by thin veins of ægirine felt, acmite, albite and analcime-natrolite. The lujavrite here has...adjacent to these rocks. It is also present in albite-analcime-natrolitebearing replacement bodies in...one or more of the minerals acmite, arfvedsonite, albite, analcime and natrolite. In the lujavrite a very |  | | Book | | Surface weathering is not the only process that may alter both magmatic and sedimentary rocks. They may also...fractions, show the same ratios to one another as do the oxide molecules or elementary atoms present in... andalusite | 100 |100 Aegirine (idealized) Albite-oligoclase Adbgs,9Ani1.1 Oligoclase Ab75An25 Andesine...above. Potash feldspar is in some cases replaced by albite, and as a rule small amounts of minerals containing...nepheline (Niggli values) St Albite-granite, Lapland Observed: 59% albite, quartz, 3% accessories 38% |  | | Book | | kimberlites continue to defy precise classification, but we do now have improved characterizations rather than the...publishers. To produce this edition all I have had to do is to generate PDF (Portable Document Format) files...printer – a much simpler task! The software used to do this included Adobe PageMaker®, for editing the entire...classifications is appropriate for the rock in question. To do this in a consistent manner, so that different petrologists...measured in those examples where it seems necessary to do so. 2.2.1 PYROCLASTS Pyroclasts are defined as fragments |  | | Book | | mineraux circulant dans les galeries de mines. On se do it de considerer ces produits comme douteux en tant...decroissement se repe te sur toutes les parties d u noyau do nt telle est la ressemblance q ue l'on pe ut s ubstituer...systeme monoclinique pour les cristaux trapus (albite, rhodonite). : (110) '' (110) --,, _,,.·...macle (111), orthose, macle de Carlsbad (fig. 64), albite, macle du pericline (fig. 65) et les mdc:les par...de solutions solides entre le feldspath sodique (albite Na[AISi 3O 8]) et le calcique (anorthite Ca[Al |  | | Report (volume) | | stabilities: C, coesite: Ks, kalsilite; AB, albite + nepheline; (AB), albite (jadeite + quartz); OR, K-feldspar;...Obviously, samples showing recognizable metasomatism can do so only on a local scale, and because volcanically...isotopes e x c e p t t h a t t h e i n c l u s i o n s do r e c o r d s o m e h i g h e r 87Sr/S6Sr ratios...composition of alkaline rocks: new data from southern Portugal and East Africa. Contrib. Mineral. Petrol. 56...Ne, nepheline; Fo, forsterite; Qz, quartz; Ab, Albite; En, enstatite; Di, diopside ; Ak, akermanite; |  | | Book (volume) | | Modern History; But in an encythe various volumes do not cover the same field or touch the same materials...renderings, obscured by complicated accents, which do service in purely learned circles and have a scientific...parts must be remembered by any reader who desires to do justice to the treatment of any large subject. Cross-references...Encyclopedia is not called upon any direct part. It has to do with knowledge, rather than opinion, and to It cannot...whether in Europe or America, it is impossible to do adequate justice here. The interest shown in the |  | | Journal (volume) | | essential changes. The editors cannot undertake to do more than correct obvious minor errors. References...essential changes. The editors cannot undertake to do more than correct obvious minor errors. References...in thunderstorms some of the heaviest disturbances do not come from the lightning itself, but the nature...essential changes. The editors cannot undertake to do more than correct obvious minor errors. References...relation to other organisms past and present. To do all this is no small task, and to say that, isnot |  | | Book (edition) | | consisting of metal- Adinole. lic silver and albite. A It is an aluminomineral. silicate of Ca, Mg...flashpoint of 380 F. Albit. A German explosive. A Albite (Pericline, Soda Felspar). mineral. It is a silicate...Caoutchouc, Mineral. See Elaterite. Gapa Homen. See Cipo do Cabod6. Caparsolate. Thiacetarsamide sodium. (525)...protein. Ciplyte. A mineral, 4Ca0.2P 2 5 .Si0 2 Cipo do Cabodo (Capa Homen). A preparation of Davilla rugosa...containers. Cleavelandite. white lamellar A mineral. albite. It is a CLE Clebrium Alloys. Heat-resisting |
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