 | | Journal (article/letter/editorial) | | 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,...5) Agate Creek, Australia (275). 6) Thuringia, Germany (285). 7) Derbyshire, England (311). 8) Northumbria...Formation, California. They found that amorphous silica (opal-A) found in the upper sedimentary layers produces |  | | 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 | | 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 |  | 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 |  | Götze, Jens, Hofmann, Beda, Machałowski, Tomasz, Tsurkan, Mikhail V., Jesionowski, Teofil, Ehrlich, Hermann, Kleeberg, Reinhard, Ottens, Berthold (2020) Biosignatures in Subsurface Filamentous Fabrics (SFF) from the Deccan Volcanic Province, India. Minerals, 10 (6) 540 doi:10.3390/min10060540 | Journal (article/letter/editorial) | | Freiberg, Brennhausgasse 14, D-09599 Freiberg, Germany; reinhard.kleeberg@mineral.tu-freiberg.de Natural...Universität Bergakademie Freiberg, D-09599 Freiberg, Germany; hermann.ehrlich@esm.tu-freiberg.de Max Bergmann...D-01069 Dresden, Germany; tsurkan@ipfdd.de Kalkofenstraße 15, D-96194 Walsdorf, Germany; ottens-mineralien@t-online...Ca-dominated (Ca-rich zeolites) and finally pure SiO2 (opal-CT, chalcedony, and macro-crystalline quartz). Assuming...reported from unnoticed, other largealthough flood basalt So-called chalcedony-amethyst stalactites were |  | | Journal (article/letter/editorial) | | classification of, lxv, 945. Andamoolca, South Australia, opal, 429. Andalusite, pseudomorphs of kyanite after...topotactic formation from y-CaSiOa, 347. Ankerite, Germany, topotactic decomposition of, 634. Anthoinite,...Arsenobismite, Brazil, 785. Artern, Sachseu-Anhalt, Germany, mellite, 542. ASWATHA~ARAYA~A(U.), Isotopic ages...Barwell meteorite, 881. Baryte, Northumberland, 983. Basalt, solubility at atmospheric ternperature, formation...LIVINGSTONE (A.), 1013. Coober Pedy, South Australia, opal, 429. Cordierite, Madras, opt., 662; beryllian, |  | | Book (edition) | | polished, 70 mm, Anjanabonoina, Madagaskar, G Page 5: Opal - fire, polished, 50 mm, Mezezo, Ethiopia, G Page...Scbwarzwald Mts., in the Sailauf quarry, Spessart Mts., Bavaria. both Germany, and from the Rabejac deposit... = = = = = Acanthite, x 16 mm, Freiberg, Germany, H Abernathyite, 12 mm, Ririera/, France, H Abhurite...the Himmelsftirst mine, Freiberg, both Saxony, Germany. In the subtropical areas acanthite may occur on...Sankt Christoph mine, near Breitenbrunn, Saxony, Germany, and many localities in the Alps, e.g. on Grossgreiner |  | | 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...Montrose, Scotland (412 Ma basalt host) and Lake Superior, USA (1100 Ma basalt BANDING IN AGATE sources...continues to be a problematic. The silica Opal-A ? opal-CT ? opal-C ? ( chalcedony + mogánite) ? granular |  | | 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 |  | | 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 |  | | 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 |  | | 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 . |  | | Catalog/List | | Rich silvery with black native ARSENIC (Schlema Germany) lxl £4 lxl £8 2x2 £15 226 LOPARITE Ce Na Ca Ti...OH good blue micro crystals on rock (Greystones Quarry,Lezant,Cornwall) 14 X 14 £2.00 lx 14 £3.50 2 ...Quartz with micro spots of Native Copper. (Kingston Quarry,Cornwall) 1x1 £2 553 TETRAHEDERITE (Cu Fe) Sb S...cleavages with cerussite and or Pyrolusite (Merehead Quarry, Mendips,Somerset) S x « £2 219 MARICOPAITE Pb...d1Aosta, Italy) lxl 60p 1x2 £1 2x2 £2 2x3 £3 307 OPAL SiO/2 H/20 pure grey white showing various colours |  | | Journal (article/letter/editorial) | | MINERALIZATION AT NABBURG–WÖLSENDORF, SOUTHEASTERN GERMANY Harald G. DILL§ and Stephan KAUFHOLD Federal Institute...Hannover, Germany Berthold WEBER Bürgermeister-Knorr Str. 8, D–92637 Weiden i.d.OPf., Germany Axel GERDES...Senckenberganlage 28, D–60054 Frankfurt am Main, Germany Abstract Nontronite has been reported from a wide...mineralization at Nabburg–Wölsendorf, in southeastern Germany, developed in a sulfur-deficient environment under...whether nontronite, kaolinite or green opal (nontronite plus opal) comes into existence. Both types of |  | | 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 |  | Tatzel, Michael, von Blanckenburg, Friedhelm, Oelze, Marcus, Schuessler, Jan A., Bohrmann, Gerhard (2015) The silicon isotope record of early silica diagenesis. Earth and Planetary Science Letters, 428. 293-303 doi:10.1016/j.epsl.2015.07.018 | Journal (article/letter/editorial) | | for Geosciences, Telegrafenberg, 14473 Potsdam, Germany Department of Earth Sciences, Institute of Geological...Geological Sciences, Freie Universität Berlin, Germany MARUM – Center for Marine Environmental Sciences...University of Bremen, Klagenfurter Str., 28359 Bremen, Germany a r t i c l e i n f o Article history: Received...Editor: G.M. Henderson Keywords: silicon isotopes opal-CT porcellanite siliceous sediment aluminum silicates...are composed of opal-CT and were formed by the conversion of amorphous silica (opal-A) from siliceous |  | | Book | | of Somerset, and M. antiquus from the Trias of Germany. Dromatkerium, from North America. Other species...the Miocene Tertiary deposits of Epplesheim in Germany, the Auvergne in France, the Val d'Arno in Italy...giganteum (Kaup), from the Miocene of Epplesheim, Hesse-Darmstadt. [Marked (B) on plan, and placed near the...Miocene Tertiary formation of Epplesheim, Hesse-Darmstadt, Germany, while others have been found in France...a range extending from England through France, Germany, Switzerland, Italy, to Armenia, India, and Ava |  | | Report (edition) | | .......................... 108 Chapter 13 Opal 109 Opal — gemstone properties .................................................................. 109 Opal terminology ........................................................................ 110 Precious opal in Western Australia ................................................................. 113 Common opal ...................................................................................... 114 Common opal in Western Australia........................... |  | | Book | | Clausthal-Zellerfeld/Oberharz. Hessisches Landesmuseum in Darmstadt. Natur-Museum Senckenberg, Senckenberg-Anlage...Albit, Beryll, Bleiglanz. Diopsid, Epidot, Granat, Opal, Prchnit, Quarzzwill. (Ja paner Gesetz!) (84/11/21-25)...(Maycn-Koblenz/Rh.-Pf.) (DGK 12/E/4) SSE v. B. kl. Basalt-Stbr. (ziemlich zuge wachsen) am Birkenkopf: Biotit...Beilstein: (Lahn-Dillkrs./Hess.) (DGK 13/A/ll) Eh. Basalt-Stbrü. im Ulmbachtal (HF): Natrolilh, Olivin (52/83)...Linck: Grossular (18/205). Benzenböhlskopf: (Darmstadt-Dieburg/Hess.) Groß Bieberau. Berchtesgaden: (Berchtesgadener |  | | Catalog/List | | 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...HYDROWOODWARDITE Wolkenstein, Erzgebirge, Saxony, Germany Blue flakes in gelatin capsule .J £5 207 ■■ |  | | Book | | Mohr-Westheide Occurrence and Distribution of Moganite and Opal-CT in Agates from Paleocene/Eocene Tuffs, El Picado...of Cuba). The agates consist of high amounts of opal and moganite. Surficial alteration of basic volcanic... 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 | | 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...: Lower Saxony, Baden, eastern Harz mountains/Germany; Galicia/Poland; Urals/USSR; Alsace-Lorraine/France; |  | | Journal (article/letter/editorial) | | albite, I56; - - , anal., d2o i, 489. Amoibite, Germany, anal., opt., X-ray, 26. Amos Stream, New Caledonia..., opt., X-ray, 453. Andamooka, South Australia, opal, 357. Andradite, chromian hydro-, Tasmania, anal...I45. Baryte, synthetic, growth spirals on, 296. Basalt, electroylsis of, 568. Basaluminite, Wales, opt...Australia, alkali feldspar, anal., d2oi, 489. Bosahan quarry, Falmouth, Cornwall, biotite, 2IO. BOWDEN (P.)...calculations, 952. Coober Pedy, South Australia, opal, 357. Copiap6, Chile, arsenolamprite, 732; schulzenite |  | | Report (edition) | | expanded to include additional occurrences of emerald, opal, agate, chalcedony, organic gems, tiger eye jasper............................. 107 Chapter 10 Opal 109 Opal properties.............................................................................. 109 Opal terminology......................................................................... 110 Precious opal in Western Australia.................................................................. 113 Common opal properties..................................... |
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