 | | Journal (issue) | | y Epstein NOTES AND NEW TECHNIQUES Opal from Opal Butte, Oregon Kevin L a n e Smith A Gemological Look...necklace 18.5 c t ) are from the Queen Mine, San Diego County, CA. In recent years, irradiation has been used...S OPALS FROM OPAL BUTTE, OREGON B y Kevin Lane Smith at Opal Butte in northeastern Oregon has produced...rainbow opal, but the less common play-of-color varieties contra luz, hydrophone, and crystal opal are economically...important. Fire, blue, and dendritic opal .ate also found. The opal occurs in rhyolite geodes embedded |  | | 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 |  | | Report (volume) | | and sapphire are considered precious gems. Some opal is precious, but most varieties are semiprecious...streams, and eventually deposited as alluvial gravels. Opal and agate are formed from aqueous solutions. Diamonds...Del Norte County; Trinity River, Trinity County; Spanish Creek and Gopher Hill, Plumas County; Placerville...Dorado County; Cherokee Flats, Yankee Hill,and Oroville, Butte County; French Corral, Nevada County; Indian...Indian Gulch and Volcano, Amador County; and Alpine Creek, Tulare County. Other western localities are: |  | Chauviré, Boris, Mollé, Valentin, Guichard, Florine, Rondeau, Benjamin, Thomas, Paul Stephen, Fritsch, Emmanuel (2023) Cracking of Gem Opals. Minerals, 13 (3) 356 doi:10.3390/min13030356 | Journal (article/letter/editorial) | | whitening or cracking. To understand the latter, 26 opal samples were investigated and separated into 2 groups...“water-stored” opal samples, which are stored in water after extraction, and “air-stored” opal samples, which... Citation: Chauviré, B.; Mollé, V.; Keywords: opal; cracking; water; TGA; drying; shrinkage; decrepitation...Therefore, we first review current knowledge on opal structure, water content, and stability and then...Therefore, we first review current knowledge on opal structure, water 2 of 18 content, and stability |  | | Journal (issue) | | originated from the same crystal. 90 Play-of-Color Opal from Wegel Tena, Wollo Province, Ethiopia Benjamin...Gaillou Describes a major new source of high-quality opal with a mostly white bodycolor. Carat Points NOTES...Turquoise Gagan Choudhary 114 New Occurrence of Fire Opal from Bemia, Madagascar Martina Simoni, Franca Caucia...Synthetic Blue Beryl A New Type of Synthetic Fire Opal: Mexifire The Color Durability of “Chocolate Pearls”...“Chocolate Pearls” Treated by Ballerina Pearl Co. Leopard Opal from Mexico The Cause of Iridescence in Rainbow |  | | Journal (issue) | | Rings in white gold and diamonds with Ethiopian opal center stones by Van Cleef & Arpels. (Photo: Van...tremendous growth in their local markets. While the USA, Japan, and Europe have mainly seen declining consumption...Gemstones. Brisbane, Australia-based Opal Horizon Ltd., an opal mining, sales, and marketing company...confidence and transparency and give jewelers and opal owners a foundation for determining market value...Powerful Source from Ethiopia Abundant play-of-color opal has been mined since early 2008 in the area around |  | | Book | | India (16 cm). Bottom left-A BiggsJasper from Oregon (16 cm). Top right - Imperial Jasper nodule from...dendrites 11) Different kind of typical eastern Oregon landscape jaspers. Top left - A slab of Succor...color in the center. Top Right - Rocky Butte Picture Jasper from Oregon with rough green dendrites on the...( 19 cm). -22- 12) In the Biggs Jasper from Oregon, oxidation lines are more complex, creating veritable...Palomino Jasper from the McDermitt area in southern Oregon (8.5 cm), photographed upside-down for a more realistic |  | | Book | | University of Missouri; J. Lewis Renton, Portland, Oregon; George J. Huss, Marquette Mineral Society, Chicago;...subvarieties of amorphous quartz, including the part on opal; Mr. Dake's many years of experience as editor of...XII Unusual Quartz Types 225 Chapter XlII The Opal 239 Chapter SiLICIFICATION AND XIV PeTRIFIED...118 Sand Crystals Arrowheads of Common 119 Opal and Agate Display of Quartz Minerals Jasper Jasper...(Egyptian) Jasper 126 133 140 146 Rimrocks of Oregon 158 Cavity Lined with Drusy Quartz l6l Nodular |  | | Book (volume) | | Colorado; colorless scheelite (19.66 ct), Kern County, California; octagonal step cut violetish pink...Vivid blue matched benitoite gems from San Benito County, California, consisting of 52 benitoites and 75...Deep, spinel red oligoclase feldspar (5.04 ct), Oregon; and three Montana sapphires, violetish blue (2...Cantlin, Ellis, [D; Jeannette B. Carillo, Gem Center USA, EI Paso, TX; Gary Christopher, The Prospectors Cache...CO; Duane L. Johnson, Rocky Mountain Soapstone, Butte, MT; Chris I. Johnston, Royal, AR; Robert W. Jones |  | | Book (edition) | | Price: $3.00. THE OPAL BOOK-by Frank Leechmon, F.G.A. The definitive book on precious opal. Complete information...color, and how to handle and cut. The only complete opal book. Nine gorgeous colar plates. Price only $7...Covering both popular ond little known oreos of OREGON e WASHINGTON BRITISH COLUMBIA • IDAHO BY...Burns, Oregon, seems to mirror the beautiful Oregon coast with clouds and breaking surf. Oregon thundereggs...Maps Commercial Diggings How tci Get In OREGON WESTERN OREGON Zealite Bonanza Nehalem River Clear Creek | | | Book (volume) | | Vivid blue matched benitoite gems from Sai, Benito County, California, consisting of 52 benitoites and 75...Deep, spine! red oligoclase feldspar (5.04 et), Oregon; and three Montana sapphires, violetish blue (2...Cantlin, Ellis, ID; Jeannette B. Carillo, Gen1 Center USA, El Paso, TX; Gary Christopher, The Prospectors Cache...CO; Duane L. Johnson, Rocky Mountain Soapstone, Butte, MT; Chris I. Johnston, Royal, AR; Robert W Jones...Resources, Vancouver, BC; Barbara L. Muntyan, Ouray County Historical Society, Ouray, CO; Merrill 0. Murphy |  | | Book (volume) | | chert, translucent chalcedony, jasp-agate and common opal, rivaling in beauty the Arizona agatized wood. This...ASHTABULA COUNTY CONNEAUT, area pits, quarries, rd. cuts, etc.⎯cone-in-cone Calcite. CLERMONT COUNTY MILFORD...CLINTON COUNTY WILMINGTON, area of Todd’s Ford, a mineral deposit⎯Hematite. COSHOCTON COUNTY AREA, townships...CUYAHOGA COUNTY CHAGRIN FALLS (on Geauga Co. line), area quarries⎯oilstone. DELAWARE COUNTY DELAWARE...nodules⎯Pyrite (crystals sharply cubic). FRANKLIN COUNTY COLUMBUS, area countywide exposures of blue clay |  | | Book (volume) | | chert, translucent chalcedony, jasp-agate and common opal, rivaling in beauty the Arizona agatized wood. This...ASHTABULA COUNTY CONNEAUT, area pits, quarries, rd. cuts, etc.⎯cone-in-cone Calcite. CLERMONT COUNTY MILFORD...CLINTON COUNTY WILMINGTON, area of Todd’s Ford, a mineral deposit⎯Hematite. COSHOCTON COUNTY AREA, townships...CUYAHOGA COUNTY CHAGRIN FALLS (on Geauga Co. line), area quarries⎯oilstone. DELAWARE COUNTY DELAWARE...nodules⎯Pyrite (crystals sharply cubic). FRANKLIN COUNTY COLUMBUS, area countywide exposures of blue clay |  | | Journal (issue) | | enjoy pearls. GemStone Press, Woodstock, Vermont, USA Schoeffel, H., 1996. Perlen, von den Mythen zu den...email: hcv.einfalt@gmx.de Abstract: The precious opal from Rangkasbitung, Banten Province in West Java...paragenesis montmorillonite – zeolite (clinoptilolite) – opal which formed in an open fresh water system at low...structural types are present: opal-A, opal-CT and a structurally intermediate opal-‘C’. All opals are composed...these granules are visible only in opal-A samples, whereas opal-CT and opal-‘C’ types appear relatively non-structured |  | | Catalog/List | | Company Refinery; Laboratories, Palmerton, Carbon County, Pennsylvania Zincite is a mineral composed of... and from the Friedensville area mines, Lehigh County, Pennsylvania as well as some from Belgium. These...Bullion-Whitlock District, Mariposa Co., California, USA This fine Gold specimen displays shining dodecahedral...(Grass Valley District), Sierra Co., California, USA Very sharp and well-defined crystalline Gold specimen...Mountain Mine, Creede District, Mineral Co., Colorado, USA Historically, as well as economically speaking, mining |  | | Journal (issue) | | stated that from 1912, carborundum manufactured in USA had replaced powdered corundum because carborundum...value of only 56 ppm V in surficial deposits of the USA (Shacklette et al., 1971) and a mean value of 59...the Vassalboro Formation, southern central Maine, USA: A case study of the role of fluid in metamorphic...condensed-filament lamps. The use of long tubelike fluorescent or opal incandescent lamps seriously dampens the effect...an equivalent cut fluorite (ic = 44.14°), a water opal (ic = 43.42°) or a silica-glass stone (ic = 43.23°) |  | | Book (volume) | | mentioned: Vermont, Pennsylvania, North Carolina, Oregon, Kansas, Alabama, Ohio, Oklahoma, Arkansas, Wyoming...El Paso, Texas. Information on the Virgin Valley opal deposits was given by G. Keith Hodson of Scottsdale...on the production of Montana alluvial sapphires. Oregon chalcedonies were ably described by Chet and Marge...as well as by Herbert W. Lawson of Terrebonne, Oregon. Information was also supplied by Dowse’s Agate...Kobuk jade locality. Descriptions of San Diego County, California, gemstones and the mines in which they |  | | Journal (issue) | | Carl A. Francis 30 "Opalite": Plastic Imitation Opal with True Play-of-Color Iohn I. Koivula and Robert...founder and editor of Tile The Sinkmlkas Library Oregon Mineralogist; and Dr. Daniel Willems of Chicago...mineralogy at the NaLural History Museum of Los Angeles County, 900 Exposition Blvd.. Los Angeles, Calilornia;...from the Little Three mine near Ramona, San Diego County, California. Mr. Gray further reported encountering...benitoite from the Benitoite Gem mine, San Benito County, California. Gem nodules are thus lznown to occur |  | | Journal (issue) | | Tanzania; (8) 6.09-ct spessartite, Ramona, San Diego County, California; ( 9 ) 10.45-ct tsavorite, Kenya; (10)...courtesy of the Natural History Museum of Los Angeles County; 6 is courtesy o f DuQuet lewelers, Inc.; 7 is...lago Trelawney Gem Collection at the Los Angeles County .Museum of Natural Hisory; photo 0 Harold es) Erica...0 Jade (JadeiteINephrite) A Lapis lazuli Q Opal @J @ Quartz 11 BtWSu- Peridot mffi - hiMM..."rainbow" jewelry (figure 12). OPAL During this decade, the major source of gem opal continued to be Australia |  | | Journal (issue) | | diamond, garnet, jade [both jadeite and nephrite], opal, peridot, quartz, spinel, tanzanite, topaz, and...well as Alaska). Other deposits occur in Xiu Lan County, Liaoning Province, and other regions of China...jadeite jade will also increase in that marketplace. OPAL Australian localities in New South Wales, Queensland...most gem opal (figure 16). However, Mexico and Brazil were important producers of “fire” opal and white...white opal. Mexican fire opal experienced strong—but brief—popularity through marketing on television shopping |  | | Book (edition) | | COVER Pictured on the front cover is a spectacular opal find from Mintabie, Australia, photographed by the...the author. The back cover pictures an opal mouse which was commissioned by and is in the collection...every new friend adds to my ever-evolving story of opal. I consider this story as a lifetime work still...and I actually went to these places, searched for opal, broke down in our camper, and met many wonderful...the years people have begun to refer to me as an opal expert. At first I was shocked at the idea. The |  | | Book (edition) | | Corporate Drive, Suite 400, Burlington MA 01803, USA First published 1962 Second edition 1970 Third edition...22 23 24 25 26 27 28 29 30 31 Spodumene Quartz Opal Turquoise Lapis Lazuli Jade – Geology and Mineralogy...Canada, Germany, Thailand, Vietnam, the UK and the USA, making this a truly international collaboration...Gemstones’ becoming ‘Colour and Colour Enhancement’, and ‘Opal’ xiii Preface to the Fifth Edition being extracted...Pierre Gilson including, most importantly, synthetic opal, both white and black, and a corresponding ingenuity |  | | Book (edition) | | polished, 70 mm, Anjanabonoina, Madagaskar, G Page 5: Opal - fire, polished, 50 mm, Mezezo, Ethiopia, G Page...abbreviations: Rep. (republic), prov. (province), co. (county), munic. (municipio), pref. (prefecture), dept...always included in text, except in the cases of the USA, UK, and the provinces Ontario and Quebec in Canada...Uintah County. Utah. and m (2.B. acanthite group). Monoclinic, C2/m, a,b,c Rio Blanco County. Colorado...Plat., Malawi, G 10 17 River Formation in Uintah County, Utah. Deer et al., v. 2A,483, 1997. Aenigmatite |  | | Journal (issue) | | 30x; photomicrograph by Robert E. Kane. Angeles County Natural History Museum showed an exact match. Nordstrandite...distinctive "chiclzen wire" structure of the synthetic opal also became more apparent. When removed from the...the incandescent bulb. This returned the synthetic opal to its original appearance. As one final observation...to the tongue, as does the porous, smoke-treated opal from Mexico. - INSTRUMENTATION AND NEW TECHNIQUES...peripheral areas of this 6-mm porous Gilson synthetic opal have absorbed water while the lighter central area |  | 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) | | extent of producing diffraction patterns (e.g., opal), (2) metamict materials that were crystalline at...few materials by X-ray diffraction order (e.g., opal). Lattice constants are generally derived es be...fibrous minerals Columbite, wolframite Quartz Opal, some yellow varieties of sphalerite Nepheline Tale...York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Puerto Rico Rhode Isand South Carolina...with native copper); Butte and Elkhorn districts, MT; Georgetown(*), Crested Butte(*), Creede(*), Aspen(*) |
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