 | | Report (issue) | | interpreted as the result of the mixture of mudstone or sandstone with pure SiO2 or by the replacement of calcite...association of spicular rocks with sublittoral sandstone and limestone, and (4) the common occurrence of...formation. The Monterey also contains feldspathic sandstone, rhyolitic tuff, mudstone (some of which is black)...occupies a f acies position between glauconitic sandstone and black shale and is underlain by phosphorite...underlain by black shale and sandstone and overlain by light-colored sandstone (Ksiazkiewicz, 1956, p. 373 |  | | Journal (article/letter/editorial) | | contributions by research workers from Russia and Germany, who only published in Russian and German. 2. Scientific...experimentation and comment to his earlier observations. Germany hosts some of the world’s finest agates and the...established the transition as: near amorphous silica → cristobalite → silica–K → quartz. Silica-K or keatite was...the direct transformation of silica glass or cristobalite. They found that no conversion took place in...conditions. The transformation proceeded via cristobalite or keatite. Experimental investigations on the |  | | Report (issue) | | Hill Stone and Construction Company Luther Clayton quarry 15 15 Other quarries 15 Silica brick 1G Definition...Cost of lands, and royalties on rock Quarrying Quarry haulage Relative advantages in (marrying floe and...Street, J Cuntingdon County Haws Refactories Company quarry, at Hawstone, Lewistown III. IV. Narrows 25...lacks Springs. HarbisonWalker Refractories Company quarry, near Mount. Union, Huntingdon County 44 Typical...Mifflin County 52 E. J. Lavino Refractories Company quarry in Chickies quartzite, on South Mountain, near |  | | Journal (article/letter/editorial) | | Chlorit", ,,A1-Chlorit") im Cornberger Sandstein yon Cornberg/Hessen GERMAN MOLLER, Heidelberg Eingegangen...material from the Kesselberg area (Black Forest, Germany). Abstract. nz~-~ n y = n x -- | 1.572• 0.002...of sand size but also fill pore spaces of the sandstone. X-ray and chemical investigations confirm that...however, new phases rich in SiO 2 and A1203, i.e. cristobalite and mullite, are formed. The sudoite of the...Eigenscha~ten des Sudoits im Cornberger Sandstein yon Cornberg 1. Verbreitung und Entstehung des Cornberger |  | | Report (issue) | | No14 Gold No15 Mica Nol6 Potash No17 Sandstone 11 Preface The Mineral Resources Consultative...crystalline forms of silica are tridymite and cristobalite, which, although uncommon in nature.are present...sands are produced from sand and weakly cemented sandstone deposits ranging from Carboniferous to Holocene...north-west Scotland where a bed of high purity sandstone, underlying Tertiary basalts, is mined by pillar...crystalline forms of silica are quartz, tridymite and cristobalite of which quartz is by far the most abundant |  | SCHMIEDER, Martin, REIMOLD, Wolf Uwe, BUCHNER, Elmar, KHIRFAN, Maria, SALAMEH, Elias, KHOURY, Hani (2011) Shock-metamorphic microfeatures in chert from the Jebel Waqf as Suwwan impact structure, Jordan. Meteoritics & Planetary Science, 46 (4) 574-586 doi:10.1111/j.1945-5100.2011.01175.x | Journal (article/letter/editorial) | | Universität Stuttgart, Herdweg 51, 70174 Stuttgart, Germany Museum für Naturkunde—Leibniz Institute at Humboldt...10115 Berlin, Germany 3 HNU Neu-Ulm University, Wileystrasse 1, 89231 Neu-Ulm, Germany 4 Department of...effect is the formation of ballen silica (a-cristobalite and a-quartz) from either lechatelierite or...glass via the retrograde crystallization of a-cristobalite upon cooling; ballen a-quartz is not known from...succession of Lower Cretaceous (Albian) fluvial sandstone (Kurnub formation), Upper Cretaceous (Cenomanian–Maastrichtian) |  | | Journal (article/letter/editorial) | | near Shelbina, Shelby County, Missouri (O'Laughlin quarry in SE 1/4, sec. 6, T. 57N., R. 9W) kaolinite occurs...endellite-halloysite comprises the clay in this now-abandoned quarry near Etzatlan, Jalisco, Mexico (Keller, 1963)....another with barite, in subsurface Cretaceous sandstone in Mississippi are shown in Figs. 9 and 10. Presumably...ach arkose, located 20km southwest of Weiden, Germany, is about 75 m thick. It was deposited, and subsequently...lignite mine about 4 km south of Leipzig, East Germany (Bellman, 1975). The "graywacke kaolin", interpreted |  | | Journal (article/letter/editorial) | | Ruhr-University Bochum, Germany 2 Department of Mineralogy, TU Bergacademy Freiberg, Germany Received March 6...application of CL in sedimentary geology, especially to sandstone, carbonate and bio-petrology (biogenic skeletons)...vs. final CL of quartz-particles in sand and sandstone, etc.) are reported in the following sections...Cretaceous sands of the Kuhfeld-Formation in W Germany, digital images of initial as well as final CL-colours...homoaxial quartz (Q) in an Upper Cretaceous quartz-sandstone of Haltern (NRW), c crossed nicols, d final CL-image |  | Greshake, Ansgar, Wirth, Richard, Fritz, Jörg, Jakubowski, Tomasz, Böttger, Ute (2018) Mullite in Libyan Desert Glass: Evidence for high-temperature/low-pressure formation. Meteoritics & Planetary Science, 53 (3) 467-481 doi:10.1111/maps.13030 | Journal (article/letter/editorial) | | atsforschung, Invalidenstraße 43, 10115 Berlin, Germany 2 Helmholtz Centre Potsdam, GFZ German Research...14473 Potsdam, Germany 3 Saalbau Weltraum Projekt, Liebigstraße 6, 64646 Heppenheim, Germany 4 Drohobycka...Sensorsysteme, Rutherfordstraße 2, 12489 Berlin, Germany * Corresponding author. E-mail: ansgar.greshake@mfn-berlin...the surrounding LDG by numerous cristobalite grains. Within cristobalite, several regions rich in mullite...cooling rates under nonequilibrium conditions. Cristobalite contains concentric and irregular internal cracks |  | | Journal (article/letter/editorial) | | demonstrated that the Avacha Bay agates contained cristobalite in addition to quartz and moganite. The fluid...(macro-crystalline quartz, quartzine, opal-A, opal-CT, cristobalite, and moganite) [8]. Some common secondary minerals...plates and grains are located in the second cristobalite-chalcedony zone, following a thin first outer...copper minerals are often an intergrowth with cristobalite spheroids and cuprite. Additionally, Radko [22]...copper and copper oxides in agates of the Norilsk region (Russia). This dispersion of micro grains of copper |  | | Journal (article/letter/editorial) | | agate and the cavity wall. The detection of cristobalite in some specimens indicates that genesis of... K EY WORDS : agate, chalcedony, mogánite, cristobalite, horizontal bands, genesis. Introduction CHALCEDONY...Summary of the agate samples used in this study. Region Site and sample number* Description{ Collector{...square brackets are the numbers analysed. * High cristobalite content was identified in some runs and these...wall-lining layers which are filled with a later central region of horizontally banded layers. Type E (3%) includes |  | | Report (volume) | | I.-Microsections of Ganister and Silicified Sandstone •.. 11.-liicrosections of Qua.rtzitee ... ....Sch. 11. 2 SILICA-ROCKS. SANDSTONES. • A sandstone is a detrital, arenaceous deposit, of which the·...term grit has often been used synonymously wit'h sandstone, but strictly speaking it should be e·mployed...grain is a conspicuous feature. The grains of a. sandstone are naturally restricted to those minerals th...cementing material. Thus, q_uartzose ferrug1:nou,~ sandstone ,will convey the idea of a rock composed largely |  | | Book | | Mineralogisches Institut der Universitiit 7500 Karlsruhe/W. Germany Volumes 1 to 9 in this series appeared under the...LlTCC) Halite, NaCl Staf3furt, Germany Sylvite, KCl Staf3furt, Germany Cryolite, Na3AlF 6 Ivigtut, Greenland...Wolsendorf, Bavaria Fluorite Andreastal, Harz, Germany 100 + 50 Al 2 0 3 801 100+ 50 Al 2 0 3 775...soils. The ti-variation of the Si0 2 minerals cristobalite and tridymite is still much greater than the...Endothermic reactions (,1 T), cause Quartz Cristobalite Tridymite Hematite Magnetite SiOz SiOz SiOz |  | | Journal (issue) | | x 2 x 1 ½ . . . . . . 4.00 m, 11 d, 111... Hesse, Germany. Botryoidal crust on rock. 3 x 2 . . . . ....Spessartite. 2 ¼ x 1 ¾ . . . . a.GO Ma>I lie. llefeld, Germany. Finelv xld. 2 ½ x 2 . . . . . . . . . . . . ....MONTHLY CO,NTENTS FOR MAY. 1·946 CHIPS FROM THE QUARRY .......................................................... 273 MINERALS OF THE H . T . CAMPBELL QUARRY OF TEXAS, MD. By Ha,·otd Le1·ey .................................... ... ............. 277 DYER QUARRY ZEOLITES (Part 3). By C. A. Thotnas .......... |  | | Journal (article/letter/editorial) | | Humboldt-Universität Berlin, Invalidenstrasse 43, 10115 Berlin, Germany 2 Department of Lithospheric Research, University...Raman spectra show that the spherules are a-cristobalite. Their occurrence together with lechatelierite...crystallization of b-cristobalite, which upon cooling inverted into a-cristobalite. Brownish inclusions...quantity between the sand dunes of the southern region of the Great Sand Sea of southwest Egypt. The irregularly...groundmass with minor inclusions of lechatelierite, cristobalite, zircon, baddeleyite, rutile, staurolite, tourmaline |  | | Journal (article/letter/editorial) | | e~rbonates a sample of dolomite, from the Ibis dolomite quarry, Mr. Flinders, Queensland, was examined by X-ray... consisting of 300 feet of clays, shales and sandstone overlain b y 500 feet of basalt . . . . Just east...QUEENSLAND 535 DESCRIPTION OF THE QUARRY. The Ibis dolomite quarry, Mt. Flinders (grid reference 857499...by the Silkstone series. In the vicinity of the quarry the upper portions of the hillocks are composed...removal of the shallow overlying black soil. In the quarry the dolomite occurs as massive blocks with horizontal |  | | Journal (article/letter/editorial) | | obscured by ero- sional remnants of Cambrian sandstone. so that good outcrops are scarce and the geology...exposed in a small portion of the north face of the quarry. Miaroles up to several inches iicross abound in...Manandona valley in central Madagascar and from the region of Ambatofinandrahana. The only reported occurrence...is still productive. In the Ambatofinandrahana region three Occurrences were known but are now virtually...dikes in the Antsirabe region of the Manandona valley and in the Betafo region south of Mahaiza were sampled |  | | Book | | Paleocene/Eocene tuffs from El Picado/Los Indios, Moa region (the Eastern part of Cuba). The agates consist...Bergakademie Freiberg, Brennhausgasse 14, 09599 Freiberg, Germany Helmholtz-Zentrum Dresden-Rossendorf, Hemholtz...Technology, Chemnitzer Str. 40, 09599 Freiberg, Germany; r.moeckel@hzdr.de Department of Geological Sciences...macrocrystalline quartz, quartzine, opal-A, opal-CT, cristobalite and/or moganite. In addition, agates often contain...(Seifert/Freiberger Präzisionsmechanik, Freiberg, Germany) with Co Kα-radiation in the range 5–80◦ (2θ). |  | | Journal (article/letter/editorial) | | insights into the petrified wood genesis in the region. Thermal inputs into the silicification process...permeation and filling rather than replacement (Hesse, 1989). Sigleo (1979) found that silica mineralization...recrystallization of both opal-A and opal-CT to α-cristobalite is both time and particularly temperature dependent...reconstructive transitions to quartz are slow, allowing cristobalite to exist in a metastable state at temperatures...Pleistocene. A tropical climate prevailed in this region then, with perhaps both deciduous and evergreen |  | | Catalog/List | | Cetineite,Loughlinite,Franckeite,Bertrandite,Cristobalite,Breunnerite,Fresnoite,Pollucite,Shortite Trona...- - - AMAZONITE Pure green cleavage Landsverlc quarry, Evje, Norway lxl S0p ALAMOSITE fcLp 10 g:...with Chrysotile, pale grey-green County Bridge Quarry,Lizard ,Cornwall MgFeSiO massive. Minas Gerias...£3.50 lx2£1 2x2 BaCaCO/3 £2.50 White mass on Sandstone Near White Nab, BASALUMINITE 1 X ½ £4 Al SO/4...½ Red brown fibrous on matrix BERAUNITE lxl £4 Germany FePO/4 £2.S0 Rich green masses with Siderite. Unusual |  | | Journal (article/letter/editorial) | | com/locate/epsl Impact melt rocks from the Ries structure, Germany: an origin as impact melt flows? Gordon R. Osinski*...~24-km diameter, ~14.5 Ma Ries impact structure, Germany. Optical and analytical scanning electron microscopy...Vapor phase crystallization of sanidine and cristobalite occurred in miarolitic cavities during late-stage...~14.5 Ma, ~24-km diameter Ries impact structure, Germany, is one of the best-preserved complex impact structures...the sedimentary succession is characterized by sandstone, siltstone and marl, whereas limestone dominates |  | Viney, Mike, Dietrich, Dagmar, Mustoe, George, Link, Paul, Lampke, Thomas, Götze, Jens, Rößler, Ronny (2016) Multi-Stage Silicification of Pliocene Wood: Re-Examination of an 1895 Discovery from Idaho, USA. Geosciences, 6 (2) 21 doi:10.3390/geosciences6020021 | Journal (article/letter/editorial) | | Technische Universität Chemnitz, Chemnitz 09107, Germany; dagmar.dietrich@mb.tu-chemnitz.de (D.D.); thomas...09599, Germany; goetze@mineral.tu-freiberg.de Museum für Naturkunde Chemnitz, Chemnitz 09111, Germany; r...Technische Universität Bergakademie Freiberg 09599, Germany Correspondence: mviney@psdschools.org; Tel.: +1-970-488-4057...Sammlungen Dresden, Germany (for Museum) more information, refer to the Dresden, Germany (for more information...HistoryCollections Collections Traugott of Chemnitz, Germany, who obtained them from the German mineral dealer |  | | Journal (article/letter/editorial) | | forschung, Berliner Strasse 19, 69 Heidelberg, Germany Sediment- Fused Tuff and Peperites in South-Central...Textures and minerals (mainly Na-sanidine and cristobalite) formed in the tuff during and after welding...unreworked, as shown by the Meters- OFeet Vantage Sandstone Member high percentage of glass shards, absence...in many places. Umatilla intercalated arkosic sandstone and conglomerate. Basalt—in general 45 m (150...confirms Smith's (1960, p. 824) conclusion lized to cristobalite, Na-sanidine, and small that incipient welding |  | | Report (chapter) | | from Australia and the Cologne Embayment, West Germany H. Wopfner SUMMARY:Silcretes are subdivided into... Group III silcretes, composed primarily of cristobalite lepispheres, developed primarily under oxidising...silcretes of the Cologne Embayment in western Germany. SEM investigations of grain surfaces and fabrics...Australian examples, with the exception that cristobalite-lepispheres are not exclusive to Group III silcretes...SEAM) whith¢ = sandstone ' silcrete o ii~ i : i : . ~i!~:i i!i ..... brown sandstone i5"/ ::i:.';: |  | | Journal (article/letter/editorial) | | and terrestrial sediments in a warm, rather arid region, frequently associated with phillipsite, chabazite...Eocene Green River Formation of the Rocky Mountains region, in the lacustrine deposits of Kramer in California...form of cement of the Pliocene to Pleistocene sandstone of Central Asia of the U.S.S.R. (BOLDYREVA, 1953)...frequently interbedded in the Cretaceous Red Sandstone of central Sahara. It consists of sand-sized idiomorphic...of a saline lake in a tropical and rather arid region. Analcime cement of the Triassic redbeds in the |
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