 | | Journal (article/letter/editorial) | | host rock or an identification of a known agate region. Key-words: agate, dating, silica, X-ray, genesis...Agate samples used for: a- XRD, b- SEM, c- density. Region Site and sample number 1. Chihuahua, Mexico Laguna:...9abc, 10ab, Germany 11abc. Idar Quarry: 1bc. 7. Derbyshire, England Waterswallows Quarry: 1a, 2a, 3a...Midland Valley, Barras Quarry: 1abc, 2c, 3c, 4c, 5c. ArdowScotland East nie Quarry: 1b, 2b, 4c, 10c, 7a...7a. Ethiebeaton Quarry: 2c, 3b, 26c, 27b, 49c. Montrose: 1c, 2c, 3c, 4c, 5c. Glenfarg: 1c, 2c, 3c, 4c, |  | | Book (volume) | | reserved. H., Hofbuchdruckerei, Cothen-Anhalt (Germany). PRECIOUS The Precious Stones. Precious others...and 195 included under minerals of bright a opal, cat’s-eye or much that transparent have occurrence...bands with the ancients precious are when opal, is for precious stones in differ dichroic...hollowed out The vacant. man form the on left Germany with to be have posture greater a window... example, as of being and lower refractive opal artificial yellowish stone he artificial For |  | | Book (edition) | | polished, 70 mm, Anjanabonoina, Madagaskar, G Page 5: Opal - fire, polished, 50 mm, Mezezo, Ethiopia, G Page...abbreviated, e.g. canton (Switzerland), vilayet (Turkey), region (Chile), kray and oblast (Russia). The country...by Mobutu, and is now the Katanga administrative region again. The former Kivu province is now divided...United States or of the Upper Silesian historical region in Poland, where the importance of ore-bearing...Scbwarzwald Mts., in the Sailauf quarry, Spessart Mts., Bavaria. both Germany, and from the Rabejac deposit |  | | Book | | zeolite mineralogy was done, at that time, in Germany, Italy, France, and Great Britain. Because of differences...containing fresh glass, montmorillonite clay, and opal; a transition zone (up to 20 mOl thick) composed...(up to 12 meters thick) that contains fresh glass, opal, and montmorillonite; a middle zone (up to 10 meters...cavities in the middle portion of the flow. Given a basalt flow 25 meters thick with an initial molten temperature...Ardeche, France, zeolites are present only where the basalt flowed into a Pliocene lake or river (Fig. 5)(Robert | | | Book | | zeolite mineralogy was done, at that time, in Germany, Italy, France, and Great Britain. Because of differences...containing fresh glass, montmorillonite clay, and opal; a transition zone (up to 20 mOl thick) composed...(up to 12 meters thick) that contains fresh glass, opal, and montmorillonite; a middle zone (up to 10 meters...cavities in the middle portion of the flow. Given a basalt flow 25 meters thick with an initial molten temperature...Ardeche, France, zeolites are present only where the basalt flowed into a Pliocene lake or river (Fig. 5)(Robert |  | | Journal (article/letter/editorial) | | and sedimentary interbeds of the Columbia River Basalt Group (CRBG) in central Washington State, USA....is diverse, with silica minerals that include opal-A, opal-CT, chalcedony, and macrocrystalline quartz...commonly, specimens contain multiple phases. Opal-A and Opal-CT often coexist. Some woods are mineralized...macrocrystalline quartz are common as minor constituents in opal wood. In these specimens, crystalline silica filling...vessels open. Diagenetic transformation of opal-A to opal-CT in fossil wood has long been a widely accepted |  | | Book | | look for. Michael O’Donoghue Proustite (East Germany) 7 Rocks We can define a rock as a large mineral...light coloured rocks with a fine-grained texture. Basalt arises from a lava solidified into a black rock...-14 Obsidian Z K ■ £ ?*«*? V -S. . _ a Basalt Slate Schist 16 Phyllite Gneiss Homfels...rubbish which may harm animals. If the site is a quarry careful arrangements with respect to equipment...sensitive. Still others may be watersoluble, and opal, for example, may need to be kept in a liquid. Many |  | | Book | | is obvious) for a mineral from Hogau (= Hegau), Germany. Of the many obsolete synonyms, "mesotype" and...commonly believed. A similar result was obtained by Hesse (1983). Nothing is known of the structure of paranatrolite... T i 0 ,1. 3 1 % H 0-, • glven as 2 • 2 Germany 1982a) Mt. St. Quebec 2.27 Hilaire, 1980)...Baden, and in the basalts of Sontra, Hessen, all Germany; - in the basalts of Usti nad Laben (= Aussig)...Lipa (= Bohmisch Leipa), all Bohemia; - in the basalt from Puy de Marman, Puy-de-Dome, France (see also |  | | Journal (article/letter/editorial) | | Ottawa Co., Ontario, in $he well-known apatite region. Analysis yielded :SiOP A120,. Fe,03. MnO. ...which the melanophlogite is planted, consists of opal, and the author is of opinion t h a t the melanoplilogite...were from the following localities : I. From the basalt-tuff of the Goldknute, Vogelsberge (sp. gr. 3.2k9)...Westerwald (sp. gr. 3.247) ; IV. From Hoheherg, near Giessen (sp. gr. 3.247) ; V. From Wolkeuburg, i n the Siebengebirge...Many lavaa, such as the leucite basalt of Ulrichstein rand the basalt of Hartlingen, are very similar |  | | Journal (article/letter/editorial) | | agates formed much later than the 135 Ma Paraná basalt host rock. Age differentiation between the two...samples proceeds along an amorphous silica ? opal-CT ? opal-C ? chalcedony pathway. K EY WORDS : agate...located in and around the Lower Cretaceous Paraná basalt. Brazilian agates have a higher mogánite content...Summary of the agate samples used in this study. Region Site and sample number* Description{ Collector{...wall-lining layers which are filled with a later central region of horizontally banded layers. Type E (3%) includes |  | Meister, Patrick, Chapligin, Bernhard, Picard, Aude, Meyer, Hanno, Fischer, Cornelius, Rettenwander, Daniel, Amthauer, Georg, Vogt, Christoph, Aiello, Ivano W. (2014) Early diagenetic quartz formation at a deep iron oxidation front in the Eastern Equatorial Pacific – A modern analogue for banded iron/chert formations?. Geochimica et Cosmochimica Acta, 137. 188-207 doi:10.1016/j.gca.2014.03.035 | Journal (article/letter/editorial) | | Microbiology, Celsiusstrasse 1, 28359 Bremen, Germany c Alfred Wegener Institute Helmholtz Centre for...Unit Potsdam, Telegrafenberg A 43, 14473 Potsdam, Germany d Department of Organismic and Evolutionary Biology...Tübingen, Sigwartstrasse 10, 72076 Tübingen, Germany f MARUM, Center for Marine Environmental Sciences...Sciences, Leobener Strasse, 28359 Bremen, Germany g Department of Geosciences, University of Bremen, Klagenfurter...Klagenfurter Straße, 28359 Bremen, Germany h Earth Science Department, Rice University, Houston, TX 77005 |  | | Book | | olivine, augite and plagioclase andesite. in basalt and plagioclase in Pegmatites When the crystallization...the rock called chert, made up of chalcedony, opal and finely crystallized quartz. Flint differs from...The collector should make a point of looking at quarry faces or cliff sections. These will be especially...pegmatite in Sweden and the Hagendorf pegmatite in Germany which give interesting phosphate minerals. The...crystalline, apart from glass and the well-known gemstone opal. Crystals differ from these two substances in the |  | | Journal (article/letter/editorial) | | true chrysocolla ” mixed wit,h large amounts of opal silica, and containing a certain amount of silica...Iron-mass, and the Occurrence of Native Iron in Basalt. By K. J. V. S T E E N S T R(JLGJLTD. UP f . 111-94)...found, that they were not contained in a vein of’ basalt, but were only covered by that rock. The iron was...the rock. No rounded masses of basalt or eucrite were found in the basalt,, and the so-called eucrite was...was not found to be separated from the basalt by a sharply-defined rust-like rind, but rather was intimately |  | | Journal (article/letter/editorial) | | controlled. Both types can be found in the same agate. Basalt and andesite are the most widespread agate host...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...view that chalcedony was a mixture of quartz and opal. This was based on the fact that the refractive...Technische Universität Bergakademie, Freiberg, Germany shows that rock thin sections were being studied |  | | Journal (article/letter/editorial) | | EXCHANGES W I L L SWAP—Professionally made jade, fire opal, agate jewelry or cut stones for good saleable mineral...mine, 15 for $ 5 . 0 0 . 10 ringsize cabochons (opal, amethyst, onyx, etc.) $ 5 . 0 0 . P. Kendall, Apartado...equipment, supplies, findings, rough Australian opal, Spec-Tec Blacklights, etc. No catalog. W i l l...CABOCHONS: Jadeite, nephrite, moonstone, star moonstone, opal, scapolite, tourmaline, moonstone and chrysoberyl...Jadeite* Rose Quartz Crystal Bakerite Turquois* Opal* Franklinite Monazite (Sand in Vial) Burkeite Purpurite |  | | Book | | immensely popular handbook of minerals appeared in Germany I obtained a copy fo! my personal library and was...equivalent. There are even some minerals, such as opal, which do not have a strictly regular internal structure...alchemist of the thirteenth century, tells us that opal wrapped in bay leaf made its wearer invisible, and...or pure sentiment where minerals are concerned. Opal is still thought to bring bad luck, and similar...fibrous sphalerite from Diepenlinchen, near Aachen, Germany. PLATE Vo I~ .·• / ~1 rhyolite 37 r . |  | | Report (edition) | | ................................ 32 Marble Bar region ........................................................................................ 36 Cue region ..................................................................................... 36 Yalgoo region .................................................................................... 40 Menzies region ................................................................................. 40 Coolgardie region .............................................. |  | | Report (edition) | | expanded to include additional occurrences of emerald, opal, agate, chalcedony, organic gems, tiger eye jasper... FRONTISPIECE Tiger iron from the Ord Ranges, Pilbara region, displaying folded bands of dark brown hematite...eye jasper from the Mount Brockman area, Pilbara region. The sphere, approximately 35 cm in diameter, contains.......................................... 34 Cue region...................................................................................... 34 Yalgoo region .............................................. |  | | Catalog/List | | 14 This catalogue cancels Ho 73 Native Silver Germany, page 1 •; :Jt r minerals 037 ANCYLITE Ce...Rich silvery with black native ARSENIC (Schlema Germany) lxl £4 248 GADOLINITE (Ce La Nd Y) Fe Be Silicate...rock with minor Chrysocolla. (Clara Mine. Wolfach Germany) £3.50 497 TELLURITE Te 0/2 good yellow crusts...CO/3 OH blue micro crystals on rock. (Greystones Quarry,Lezant,Cornwall) £2.00 lx H £3.50 2 076 CALEDONITE...needed) (Schlackental, Nr Oberschulenberg Harz Mt3 ,Germany) 2cm £4.50 153 CLINOTYROLITE CaCu(As,S) 0 clearly |  | | Catalog/List | | 424 ■■ CRISTOBALITE Vechec, Slanske Mtns, Presov Region, Slovakia I to 2mm white crystals scattered on...5mm vugh in lxl inch Basalt Zeolite lxl £5 166 II: ■ GISMONDINE Green road Quarry, Ballyclare, County...County Antrim Chalk')' white areas on Basalt. ½ inch £4 I inch £8 Zeolite 169 ■■ GONNARDITE Hillsport, Island...Antrim, N.lrelan Quite rich white radiating mass on Basalt Zeolite _{ Ix! £6 .~ 242 ■■ GUDMUNDITE Pezinok...mass Ix½ £5 Ix! £8 Fe Sb S 370 ■■ HAINITE Bortolan Quarry, Pocos de Caldas Minas Gerais, Small fawn fibres |  | | Book | | Mohr-Westheide Occurrence and Distribution of Moganite and Opal-CT in Agates from Paleocene/Eocene Tuffs, El Picado...Indios, Moa region (the Eastern part of Cuba). The agates consist of high amounts of opal and moganite... T. Occurrence and Distribution of Moganite and Opal-CT in Agates from Paleocene/Eocene Tuffs, El Picado...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 |  | | Book | | found in nature are listed generally either as a region or a country. To find specific localities, other...cristobalite, citrine, amethyst, and tridymite, as \Veil as opal, are poly.morphs of silica. Most minerals occur...common opal is caused by the reflection of light. Opalization A speckled play or color of opal is observed...gypsum, halite, calcite. Found in : Lower Saxony/Germany; Czechoslovakia; Yugoslavia; Surrey/England; Colorado/USA;...by: ordinary coal. Found in: Thuringia, Saxony/Germany; Czechoslovakia; Seine/France, Tula/ USSR. Similar | | | Book | | found in nature are listed generally either as a region or a country. To find specific localities, other...cristobalite, citrine, amethyst, and tridymite, as \vell as opal, are poly.morphs of silica. Most minerals occur...common opal is caused by the reflection of light. Opalization A speckled play of color of opal is observed...gypsum, halite, calcite. Found in: Lower Saxony/Germany; Czechoslovakia; Yugoslavia ; Surrey/England; Colorado/USA;...by: ordinary coal. Found in: Thuringia, Saxony/Germany; Czechoslovakia; Seine/France, Tula/ USSR. Similar |  | | Journal (article/letter/editorial) | | T H E STORY OF OPAL By G. FREDERICK SHEPHERD Technical Assistant In Geology - (1932) Museum of Science...Science and Industry, Chicago, Illinois Opal An Evil Omen? It is most deplorable that the mind of the...the mag nificent and ever-changing beauty of the opal to be maligned with puny super stition. Many objects...misunderstanding, ungrounded re port, or superstition, and the opal is one of them — with little, if any, reason for...for the spread of its ill-fated powers. The opal has not always been thought of as being unlucky, and it | | | Book | | photos of minerals— listed generally either as a region or a corresponds to the group of minerals dis-...cristobalite, citrine, amethyst, and tridymite, as well as opal, are polymorphs of silica. Most minerals occur...blue or pearly Pleochroism appearance of common opal is caused by the reflection of light. Some transparent...differently Opalization A speckled play of color of opal is observed and changes according depending on...gypsum, halite, calcite. Found in: Lower Saxony/Germany; Czechoslovakia; Yugoslavia; Surrey/England; 6* |
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