 | | 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 |  | | Book | | in Adamello Massif, Central Southern Alps, Italy: An Investigation of Its Mineralogy, Crystallography... . . . 226 Kandy K. Wang, Ian T. Graham, Laure Martin, Panagiotis Voudouris, Gaston Giuliani, Angela... . 267 Ian T. Graham, Stephen J. Harris, Laure Martin, Angela Lay and Eduardo Zappettini Enigmatic Alluvial... . . 294 Paula C. Piilonen, F. Lin Sutherland, Martin Danišı́k, Glenn Poirier, John W. Valley and Ralph...Jason R. Gascooke, Martin R. Johnston and Allan Pring A Review of the Classification of Opal with Reference |  | | 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 |  | | 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 (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 specimens⎯fossils...deposits⎯Hematite. OTTAWA COUNTY CLAY CENTER, area limestone quarry, famed⎯Calcite, 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 specimens⎯fossils...deposits⎯Hematite. OTTAWA COUNTY CLAY CENTER, area limestone quarry, famed⎯Calcite, Celestite (fluorescent), Dolomite |  | | Journal (issue) | | mmigration Ol ice. Opal Mines, Wbite Cllifs, New South Wales. Oourte8JI Special Opal Nuinber Granite and...magazine• .'-============================ 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..................... |  | | 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...96 Alain Marchal 102 Marco Marchesini 108 Peter Martin Clive Minker Norman Moles Peter Moore Peter Nancarrow...Pearce Jolyon Ralph Roger Robinson Roy Starkey Martin Stolworthy Philip Taylor Colleen Thomson Rob Tripp... BOL1WOODITE 7mm. Goanikontes Claim, Araandis, Swakopmund District, Erongo Region, Namibia. Photo: John Hall CALCITE |  | | 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 ‘y - ml 3 ee pon * : c= : an vi 5 = fii? i a j — » ya y _— ’* : ...loan of photographs of Tampa Bay silicified coral. An outstanding compilation of Mexican gemstone information |  | | 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........................... |  | 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...Institut fur Mineralogie der Universitat Wien, Austria. Michael Zolensky: Lyndon Johnson Space Center...XV xvi Introduction international members and an affirmative response of at least two-thirds of those...Once accepted, the information must be published in an appropriate journal within two years or the CNMMN |  | | 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 “middle basalt” formation. Investigated opals generally show vitreous-dull...variable growth rates. Key words: Faroe Islands, opal, magmatism, trace elements, phosphorous, XRD, SEM...Bordoy, Vagar, Suduroy and Sandoy (see Fig. 1, from Martin & Weissbarth 1978). These islands are considered...species like apophyllite, calcite, cristobalite, opal, chalcedony and native copper (Jørgensen 2006, Ghizzoni |  | | Book (volume) | | Plains, wells drilled deep into this unit provide an inexhaustible supply of cold artesian, Rocky Mountain...banks, tributary gravels, etc.petrified wood, wood opal. CORSON COUNTY LITTLE EAGLE: area ridges, slopes...slopes, stream beds, etc. petrified wood, wood opal; along the Grand R. though entire Co., regional...banks, breaks, gravels, etc. petrified wood, wood opal. 438 A Location Guide for Rock Hounds in the...minesColumbite, Gold, Silver, etc.; and (2) Old Marble Quarry on the Needles Hwy. 5.5 mi. NEScheelite, and deep |  | | 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 |  | 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-μm range is an effective tool for evaluating subtle patterns of...disturbed by mining activities. The Cuprite mining district is located about 200 km northwest of Las Vegas...Stonewall Mountain Hi 37 o 30' Figure 2 Cuprite o an yo n Inferred caldera margin 266 117 15' ck Pa |  | | 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) | | 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 |  | | Journal (issue) | | ISSUE 10 • OCTOBER 2020 FASCINATING FACTS ABOUT OPAL CLAIM TO COPPER FAME Butte’s Mining Legacy DYNAMIC...Printed in the U.S.A. 10 0 74470 02033 2 WIN AN OPAL PRIZE PACK! Details on page 6… 2 ROCKNGEM.COM...NEVADA’S CARLIN TREND America’s Greatest Gold-Mining District 64 CAPTIVATING FIND AT CARVER AGATE FIELD Geologic...By Steve Voynick 28 10 FASCINATING FACTS ABOUT OPAL By John L. Carver and Bill Halepeska 62 REGULAR...specimen of opal from the prolific USA locality of Butte, Oregon, reveals a carving-grade opal as it is |  | | Book (edition) | | SIMON & SCHUSTER'S GUIDE TO ROCKS AND MINERALS An easy-to-use field guide, with over 1,000 spectacular...spectacular illustrations— 600 in full color. Edited by Martin Prinz, George Harlow and Joseph Peters, The American...Rodolfo Crespi and Giuseppe Edited by Liborio Martin Prinz, George Harlow and Joseph Peters, The American...collecting. Mineralogy-Collectors and collecting. Prinz, Martin. II. Harlow, George. III. Peters, Joseph, date...minerals, because regardless of whether they form by an organic or inorganic process, they are man made. |  | | Report (issue) | | Contents 4 Map: Notable Opal Localities 50 BY BRUCE PAUL GABER 6 The Opal Enigma: Science, History...and Pins Afire: Play of Color in Opal BY MAX WEIBEL Sparkling Opal in Ancient Bones: Precious Relics...vibrant with opal pattern and color. In this extreme close-up of a Lightning Ridge black opal, the field...approximately 3 mm wide. Opal courtesy Jenni Brammall BY ALEX RITCHIE 52 An Opal Glossary of Terms BY...BY SI AND ANN FRAZIER BY PETER HUBER 64 Opal from Mexico: Unsurpassed Fire BY JURGEN SCHUTZ 18 Perfect |  | | Book (volume) | | it essential same this In species and with an other primary crystalline largely opaque stones...and 195 included under minerals of bright a opal, cat’s-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...form a facet each stone prismatic octahedron an As suitable it proportion to as RELATED stones |  | | Book (edition) | | ■ THE MOSCOW OPAL MINES 1890 to 1893 (The First Commercial Opal Mines in the Ujiiled States) Mon Brockett...$3.00 . ■ The Moscow Opal Mines—1890 to 1893 (The First Commercial Opal Mines in the United States)...United States of America U.S.A. OPAL COUNTRY (Precious Opal near towns located on map) OPALS "found...COlFA* -rftO Y PjiLtiM • GtntSEE • LSi/is to'v LOST OPAL MINE on "high hill opposite Lewiston, Idaho." Discovered...run." May, 1896. TH^ HOSCOW OPAL MIA/e? The opal is about 3/8 of an inch in diameter and from the |  | | Journal (article/letter/editorial) | | Impactite Tektite Frictionite Fulgurite Buchite Opal Glass properties a b s t r a c t Vitreous materials...Compared to industrial glasses, natural glasses have an essential advantage in terms of their lifespan in...of a final toxic-waste deposit. The development of an adequate technology for final waste disposal is a...position of natural non-crystalline solids such as opal, amber, kieselguhr or kerogen within the group of...formed completely differently. Due to the impact of an extraterrestrial body on the surface of the earth |  | | Book | | Martin Okrusch Hartwig E. Frimmel Mineralogy An Introduction to Minerals, Rocks, and Mineral Deposits...springer.com/series/15201 Martin Okrusch Hartwig E. Frimmel Mineralogy An Introduction to Minerals,... Rocks, and Mineral Deposits Martin Okrusch Institute of Geography and Geology University of Würzburg...editions. After Matthes’ death in 1999, one of us, Martin Okrusch, who had succeeded Matthes as chair of...comprehensiveness. Many subjects are dealt with to an extent that goes beyond what is typically expected |  | Lee, M. R., MacLaren, I., Andersson, S. M. L., Kovács, 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, 1362–1377 (2015) doi: 10.1111/maps.12471 Opal-A in the Nakhla meteorite: A tracer of ephemeral...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...Inc. on behalf of The Meteoritical Society. This is an open access article under the terms of the Creative |
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Basalt quarry, Pauliberg, Markt Sankt Martin, Oberpullendorf District, Burgenland, Austria