 | | 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 |  | | 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 magĀ nificent and ever-changing beauty of the opal to be maligned with puny superĀ stition. Many objects...misunderstanding, ungrounded reĀ port, or superstition, and the opal is one of them ā 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 (volume) | | reserved. H., Hofbuchdruckerei, Cothen-Anhalt (Germany). PRECIOUS The Precious Stones. Precious others...it essential same this In species and with an other primary crystalline largely opaque stones...and 195 included under minerals of bright a opal, catās-eye or much that transparent have occurrence...Stones STONES. the shall description include an dealing with rockThe minerals section mention ...and angle into reduced higher other less a an brilliants and some wearing for of that it |  | | Journal (issue) | | mmigration Ol ice. Opal Mines, Wbite Cllifs, New South Wales. Oourte8JI Special Opal Nuinber Granite and...magazineā¢ .'-============================ r ROCH. S an d MINERALS A NON-TECHNICAL MAGAZINE --'ON-MINI...1Iuseum. B y 1rilli<1m F. Foshag The Geology of Opal. By, Oilb rrt Hart.. . . . . . . . . . . . . . ...Quest of the Opal. B!I If. T. Strnng.. . ....................... . . ('(}Jor Play in Opal. B.11, Il. E... . . . . . . . . . . . . . . . . . . . . . 'fbe Opal. JJy E11,qe11e Jr. B1"11k..................... |  | | Journal (article/letter/editorial) | | sitƤt, Jena, Germany Mineralogisches Institut, TU Bergakademie Freiberg/Saxony, Germany a r t i c l...Impactite Tektite Frictionite Fulgurite Buchite Opal Glass properties a b s t r a c t Vitreous materials...Republic; 3rd in 1996 at the University of Jena, Germany, 4th in 2002 in Lyon, France), as well as the Interdisciplinary...Compared to industrial glasses, natural glasses have an essential advantage in terms of their lifespan in...of a ļ¬nal toxic-waste deposit. The development of an adequate technology for ļ¬nal waste disposal is a |  | | Journal (issue) | | d i e s cutting Petersburg granite in the Dale quarry (Figure 1). Clear glassy areas within the crystals...gems (Frank Crayton, personal communication). The quarry is operated by Tarmac Inc. Powhutcan County - Clear...Golden beryl has also been found in the residuum above an alaskite d i e along a ridge crest about 0.5 miles...Tract , (Dunlap) mine. The chrysocolla is :generally an intense blue color and is often associated with greer...inpegmatite,largest crystal 3 inches long, Dale quarry, ChestefieldCounty(photograph by T. M. Gathright |  | | Report (edition) | | .......................... 108 Chapter 13 Opal 109 Opal ā gemstone properties .................................................................. 109 Opal terminology ........................................................................ 110 Precious opal in Western Australia ................................................................. 113 Common opal ...................................................................................... 114 Common opal in Western Australia........................... |  | | Book | | in Adamello Massif, Central Southern Alps, Italy: An Investigation of Its Mineralogy, Crystallography...and Allan Pring A Review of the Classiļ¬cation of Opal with Reference to Recent New Localities Reprinted...Economic Geology from the University of Hamburg (Germany), where he also served as a Visiting Professor...collaborative research projects worldwide. Ian Graham is also an Associate Editor of Mineralogical Magazine and the... is positioned between academia and industry. As an applied science, in gemology, the instruments used |  | | Journal (article/letter/editorial) | | historical point of view. Nice yellowish-red color fire opal and common opals from these islands are also very...Streymoy. Parent rocks are represented by the āmiddle basaltā formation. Investigated opals generally show vitreous-dull...variable growth rates. Key words: Faroe Islands, opal, magmatism, trace elements, phosphorous, XRD, SEM...species like apophyllite, calcite, cristobalite, opal, chalcedony and native copper (JĆørgensen 2006, Ghizzoni...historical point of view; nice yellowish-red color fire opal and common opals have been frequently found in |  | Gaines, Richard V., Skinner, H. Catherine W., Foord, Eugene E., Mason, Brian, Rosenzweig, Abraham, King, Vandall T. (1997) Dana's New Mineralogy (8th ed.) Wiley-Interscience. p.1872 | Book (edition) | | role in naming the plants and animals, also showed an interest in classifying the minerals. His natural...synonymy was improved and extended. The work became an international classic for over 50 years, due to the...Fritz: Bergakademie Freiberg, Freiberg, Saxony, Germany. Donald B. Hoover: U.S.G.S., Federal Center, Lakewood...Institut fur Mineralogie, Ruhr Universitat Bochum, Germany. Duane Mellor: Geology Library, Yale University...Berlin, Germany. Peter Susse: MINABS, Inst. of Mineralogy, Univ. of Gottingen, Gottingen, Germany. C. Sheldon |  | Swayze, G. A., Clark, R. N., Goetz, A. F. H., Livo, K. E., Breit, G. N., Kruse, F. A., Sutley, S. J., Snee, L. W., Lowers, H. A., Post, J. L., Stoffregen, R. E., Ashley, R. P. (2014) Mapping Advanced Argillic Alteration at Cuprite, Nevada, Using Imaging Spectroscopy. Economic Geology, 109 (5) 1179-1221 doi:10.2113/econgeo.109.5.1179 | Journal (article/letter/editorial) | | hydrothermal alteration. Partial lichen cover on opal spectrally mimics chalcedony, limiting its detection...Kerr et al., 2011). Spectroscopy is also playing an increasing role in analyses of alteration in drill...near-infrared (VIS-NIR or VNIR-SWIR) 0.4- to 2.5-Ī¼m range is an effective tool for evaluating subtle patterns of...Stonewall Mountain Hi 37 o 30' Figure 2 Cuprite o an yo n Inferred caldera margin 266 117 15' ck Pa...rhyolitic ashflow and airfall tuffs, conglomerate, and basalt (Fig. 3). For convenience, the foci of the two |  | | Journal (article/letter/editorial) | | silica coating on young basalt from Kilauea, Hawaii, as well as hyalite (opal-AN), silica sinters, and...silica gels and silicic acid. Pulse delays of up to an hour were employed for silica samples with slow spin...secondary phase in various geological environments. Opal is common in neutral-pH hydrothermal settings, where...coatings formed by acid-sulfate alteration of Hawaiian basalt. NMR has been applied to various aspects of the...reported an additional, smaller peak due to silicons with single attached OH groups (Q3) in some opal-CT samples |  | | Book (volume) | | concerned, Ohio is unique in but a single gemstone, an exceptionally high quality, colorful flint that is...chert, translucent chalcedony, jasp-agate and common opal, rivaling in beauty the Arizona agatized wood. This...the western counties, especially the Clay Center Quarry 12 miles southeast of Toledo but in Ottawa Co....jct. of Brint St. and Centennial rd., the Medusa Quarry (SW of 4 quarries), very many specimensāÆfossils...depositsāÆHematite. OTTAWA COUNTY CLAY CENTER, area limestone quarry, famedāÆCalcite, Celestite (fluorescent), Dolomite |  | | Book (volume) | | concerned, Ohio is unique in but a single gemstone, an exceptionally high quality, colorful flint that is...chert, translucent chalcedony, jasp-agate and common opal, rivaling in beauty the Arizona agatized wood. This...the western counties, especially the Clay Center Quarry 12 miles southeast of Toledo but in Ottawa Co....jct. of Brint St. and Centennial rd., the Medusa Quarry (SW of 4 quarries), very many specimensāÆfossils...depositsāÆHematite. OTTAWA COUNTY CLAY CENTER, area limestone quarry, famedāÆCalcite, Celestite (fluorescent), Dolomite |  | | Book (volume) | | review of deposits, a helpful geographical index, and an exceptionally complete listing of books and arucles...America has developed into a major exporter rather than an importer. A VAN NOSTRAND REINHOLD BOOK . Digitized...AMERICA In Iwo Volumes Volume | JOHN SINKANKAS [aN] VAN New NOSTRAND York Cincinnati REINHOLD Toronto...neat erie ra 8 āy - ml 3 ee pon * : c= : an vi 5 = fii? i a j ā Ā» ya y _ā ā* : ...loan of photographs of Tampa Bay silicified coral. An outstanding compilation of Mexican gemstone information |  | Lee, M. R., MacLaren, I., Andersson, S. M. L., KovĆ”cs, A., Tomkinson, T., Mark, D. F., Smith, C. L. (2015) Opal-A in the Nakhla meteorite: A tracer of ephemeral liquid water in the Amazonian crust of Mars. Meteoritics & Planetary Science, 50 (8) 1362-1377 doi:10.1111/maps.12471 | Journal (article/letter/editorial) | | Nr 8, 1362ā1377 (2015) doi: 10.1111/maps.12471 Opal-A in the Nakhla meteorite: A tracer of ephemeral...Forschungszentrum Jā¬ ulich GmbH, 52425 Jā¬ ulich, Germany 4 Scottish Universities Environmental Research...its principal constituents are nanoparticles of opal-A. This hydrous and amorphous phase precipitated...respect to silica by dissolution of olivine. Each opal-A nanoparticle is enclosed within a ferrihydrite...nanoparticles and olivine. The fluids that formed both the opal-A/ferrihydrite and the siderite were sourced from |  | | Book (volume) | | variegated colours. About one and a Sutherland. an outlier half miles south of Cape Wrath, near Torridon...filamentous net-work is here brown. of Ayrshire. At Lagg Quarry, Fisherton, Ayr. structure is yellow or brown,...porphyritic stone. : : Liulithgowshire in an opening near the old quarry of Kirkton, masses in limestone of...attention to Mineralogy. During the time that has an exceptionally large number of specimens from almost...Museum of localities of Scottish Science and Art. In an Appendix references are given to information which |  | | Book (edition) | | great changes of emphasis in mineral collecting and an unforeseen growth in the number of collectors. Mineral...Africa, and Asia have become significant sources. An increasing recognition of investment values in fine...carefully preserved to arrive on a dealer's shelf in an unblemished state. Would that the old-time miners...common can't-be-bothered attitude can be replaced by an enlightened recognition of the operators' public...insurance coverage for the protection of the mine and quarry operators. The writer wishes to express his appreciation |  | | Book (volume) | | Plains, wells drilled deep into this unit provide an inexhaustible supply of cold artesian, Rocky Mountain...banks, tributary gravels, etc.ļ¾petrified wood, wood opal. CORSON COUNTY LITTLE EAGLE: ļ area ridges, slopes...slopes, stream beds, etc. ļ¾petrified wood, wood opal; ļ along the Grand R. though entire Co., regional...banks, breaks, gravels, etc. ļ¾petrified wood, wood opal. 438 A Location Guide for Rock Hounds in the...minesļ¾Columbite, Gold, Silver, etc.; and (2) Old Marble Quarry on the Needles Hwy. 5.5 mi. NEļ¾Scheelite, and deep |  | | Journal (article/letter/editorial) | | correlation with silicon content, as does 6ā*0. Opal from both sponge spicules and sinters is light,...occur during the low temperature precipitation of opal and, possibly, poorly ordered phyllosilicates, with...d3āSi values are largely inherited, but the primary opal 630Si values can be modified by isotopic equilibration...and dissolved silicon during the transformation of opal into quartz. INTRODUCTION IN the 1950ās, variations...22.86 cm. radius Nier-type mass spectrometer with an all metal sample introduction system, except for |  | | Book | | For all thei.r skiUs and expertise - wor1h more th,an gold were the.y. We also must ac.knowle.dg-e, f,o...one's favourite specimens for this publication. Not an easy task. As the current chairman of SMLS I hope...Meschede, Sauerland, North Rhine - Westphalia , Germany . Photo: John Hall SMLS MEMBERS' FAVOURITES This...hydraulic shaft in the Smallcleugh Mine and we bought an inflatable dinghy so we could land on Sgurr nam Boe...something from each field trip. Thus I have accumulated an eclectic collection of rocks, minerals and fossils |  | | Journal (issue) | | Clarity Grading . . . āChocolate Pearlsā. . . Leopard Opal . . . Rainbow Andradite from Japan THE QUARTERLY...these products. 236 Leopard Opal: Play-of-Color Opal in Vesicular Basalt from ZimapĆ”n, Hidalgo State...Myanmar ā¢ Moonstone from Madagascar ā¢ Phenomenal fire opal ā¢ āSunsetā quartz from Brazil ā¢ Swedish Blue (slag)...University) with a degree in natural science. As an officer in the U.S. Navy from 1942 to 1946, he read...gems to pass the long hours at sea and even arranged an unscheduled stop in Colombo, the capital of Ceylon |  | | Journal (article/letter/editorial) | | Berlin, Malteserstrasse 74-100, 12249 Berlin, Germany; milke@zedat.fu-berlin.de * Correspondence: limo@zedat...Abstract: The formation of ordered particle arrays plays an essential role in nanotechnology, biological systems...reveals that particle morphologies trace the flow of opal-forming colloidal suspensions and document syn-...replacement of non-silicate minerals proceeds via an interface-coupled dissolution precipitation process...clastic sediments. Keywords: silica; opal-A; common opal; precious opal; silica colloid; photonic crystal; |  | | Journal (issue) | | The Cheapside Hoard: An Extraordinary Collection of Jewels Digit Patterns in Opal Agate from Morocco Field...129 138 On the Origin of Digit Patterns in Gem Opal Benjamin Rondeau, Jean-Pierre Gauthier, Francesco...this finger-like feature, mostly found in Ethiopian opal, and proposes a multi-step model for its formation...jadeite rock ā¢ Determining hydrophane nature of opal ā¢ Green sapphire, glass-filled ā¢ Large pinkish brown...faceted fuchsite ā¢ Polymer-coated corundum ā¢ Dyed fire opal ā¢ June 2013 Hong Kong Jewellery & Gem Fair Editorial |  | | Book | | Martin Okrusch Hartwig E. Frimmel Mineralogy An Introduction to Minerals, Rocks, and Mineral Deposits...com/series/15201 Martin Okrusch Hartwig E. Frimmel Mineralogy An Introduction to Minerals, Rocks, and Mineral Deposits...Geology University of WĆ¼rzburg WĆ¼rzburg, Bavaria, Germany Hartwig E. Frimmel Institute of Geography and...Geology University of WĆ¼rzburg WĆ¼rzburg, Bavaria, Germany Department of Geological Sciences University of...Control Number: 2018945875 Ā© Springer-Verlag GmbH Germany, part of Springer Nature 2020 This work is subject |
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