 | | 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 |  | | Journal (article/letter/editorial) | | Bill Cole 4 0 8 Dickinson, Chillicothe, M o . OPAL Opal is a common mineral, being present in many forms...deep in the earth. Many other varieties of common opal are also known including the brilliantly fluorescent...western deserts. However the gem quality of precious opal is exceedingly rare and few localities produce a...a good grade. The physical properties of opal are S.G. 2.10, hardness 5*/2 to 6l/ 2 , refractive index...resinous and some even have a chalky appearance. Opal is a hydrous silicon oxide, the water content is |  | | Journal (article/letter/editorial) | | THE GEM VARIETIES OF OPAL By RALPH C. GOSSE Albany, New York Introduction This paper is by no means...the many varieties, occurrences, colors, of the opal. Those only of gem quality will be treated here...groups, precious and common. Precious Opal: Any variety of the opal showing a play of color, regardless..."precious" used in connection with opal does not necessarily infer value, an opal may be of the precious variety...not gem quality, and vice versa. Common Opal: Any variety of opal which has no play of color, regardless |  | | Journal (issue) | | DEATH VALLEY JEEP TRAILS by Roger Mitchell. Although a system of paved roads covers Death Valley National...pages, $2.95. A GUIDEBOOK TO THE SOUTHERN SIERRA NEVADA by Russ Leadabrand. Illustrated with good photographs...C. Likes by Dorothy Robertson NOODLING IN VIRGIN VALLEY THE COVER: Utah's Capitol Reef National Monument...beheading of at least 13 victims in the Nahanni Valley; and many other equally bewildering happenings...desert city of Desert Hot Springs in the Coachella Valley of California. The cover shot this month features |  | | Journal (issue) | | 83642 Show Room Now Open! M-F 7:30-4:00 MST NEW OPAL SHIPMENT IN FROM ETHIOPIA THIS MAY BE THE BRIGHTEST...COLORFUL AA & AAA GRADE OPAL. PLEASE SEE OUR WEBSITE FOR NEW LISTINGS OF THIS OPAL THE VILLAGE SMITHY OPALS...digital issues that contain features and columns about opal science, history, discoveries, cutting and carving...automatically be entered for a chance to win one of four Opal Prize Packs! **More details below. This column and...Opals, LLC, Royal Peacock Opal Mines, Kingsley North, The House of Tibara, Opal Resource Canada, Inc., A&S |  | | Catalog/List | | TX 75261-4127 (NW Corner of Airport Freeway & Valley View Lane) FLOOR Session (Floor, Telephone, HERITAGELive...Dallas, TX 75261-4127 NW Corner of Airport Freeway & Valley View Lane Thursday, September 24 – Friday, September...Texas 75261-4127 NW Corner of Airport Freeway & Valley View Lane Phone 214-528-3500 877-HERITAGE (437-4824)...from Mozambique – the “Jena Blue” • An amazing Fire Opal weighing an astounding 61.58 carats from Mexico...the noted Virgin Valley locality with superb size and coloration • A Bee fossilized in Opal, believed |  | | Book | | varieties, with favorite location of quartz agate, opal wood — collectors. The petrified gems throughout... tell about other quartz varieties such as the opal, and petrified wood; and to give him the most complete...Other Quartz Chapter 5. Opal and Its 25 30 50 Varieties Glossary of Opal Terms 54 Wood 62 Chapter... ehrysoprase, tigereye, and common and precious opal. In the general opinion of most collectors, chalcedony...processing the surrounding country’s Along the valley of the Roman came upon and unimpressive group |  | | Report (issue) | | MINERALS OF NEVADA MINERALS OF NEVADA Peer Hen By CASTOR oan eGORY.C.oFER DOCK NEVADA AND BUREAU... UNIVERSITY Reno & Las Vegas OF NEVADA PRESS GEOLOGY Nevada Bureau of Mines and Geology Special...University of Nevada Press, Reno, Nevada 89557 USA Copyright © 2004 by University of Nevada Press Photographs...Districts and significant mineral occurrences of Nevada by Nevada Bureau of Mines and Geology All rights reserved...Cataloging-in-Publication Data Castor, Stephen B, Minerals of Nevada / Stephen B. Castor and Gregory C. Ferdock.— Ist | | | Report (issue) | | MINERALS OF NEVADA MINERALS OF NEVADA STEPHEN B. CASTOR and G R EGOR Y C . F E R D OC K l NEVADA BUREAU...association with the UNIVERSITY OF NEVADA PRESS Reno & Las Vegas Nevada Bureau of Mines and Geology Special...University of Nevada Press, Reno, Nevada 89557 USA Copyright© 2004 by Uni versity of Nevada Press Photographs...Districts and si gnificant minernl occurrences of Nevada by Nevada Bureau of Mines and Geology All rights reserved...-Publ ication Dat,i Castor, Stephen B. Minerals of Nevada/ Stephen B. Castor and Gregory C. Ferdock.- rst |  | | Journal (article/letter/editorial) | | minerals Article A Review of the Classification of Opal with Reference to Recent New Localities Neville...Abstract: Our examination of over 230 worldwide opal samples shows that X-ray diffraction (XRD) remains...for delineation and classification of opal-A, opal-CT and opal-C, though we found that mid-range infra-red...provenance. The corpus of results indicated that the opal-CT group covers a range of structural states and...At the one end are the opal-CTs that provide a simple XRD pattern (“simple” opal-CT) that includes Ethiopian | | | Book | | ties and forms of quartz gems other than agate, opal and its varieties, and petrified wood a great favorite...tell abot1t otl1er Cttiartz varieties st1ch as the opal, jasper, ancl petrified wood; a11d to give l1in1...chryso1)rase, tigereye, and common and preciot1s opal. In the gen eral 01)inion of n1ost collectors, chalced...irort1m, the present-clay city of Tre,,es. Along tl1e valley of tl1e ~Ioselle River passecl the Ro111a11 legions...ra11ge ancl l)enetratecl a valley rt1nni11g l)arallel to the Moselle Valley to join r f • • Fie. |  | | Journal (issue) | | JEWELRY WORLD-CLASS MINERALS in Dallas Black Bay Opal FACETING DESIGN: Nested Triangles FIELD TRIP:...STAINLESS STEEL CABBING UNIT This machine is made in the USA for Kingsley North. Features an all stainless steel...Hill Gems and Minerals Hall by Bob Jones Black Bay Opal............................................ 20 A................................... 36 Wulfenite, Nevada state rocks, crystal habits Diamonds: Deep-Earth...speed control is great at low speeds for cutting opal and other delicate material. —Sessin Durgham, award-winning |  | | Journal (issue) | | historic pieces from assorted localities in the USA. Pieces selected from the American Philosophical...(Continues on page 3 Opal Claudeen Chisholm & Bill Shelton laeliason@msn.com The Name. Opal, at least the word...necessarily was used to refer to the gem we know today as opal. The first use in English is attributed to Philemon...■ Opale French ■ Opal English History. One source indicates several very early opal discoveries including...where opal was extracted in Eastern Africa. A tomb in Southern Mesopotamia (3000 BC) yielded opal as well |  | | 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 |  | | Catalog/List | | Golds from Alaska, Arizona, Australia, California, Nevada and several other places. The Fine Minerals category...Gemstone: Pink Tourmaline - 7.85 Cts. California, USA Pink Tourmaline is one of the most popular and recognizable...mine; Harris mine) Wah Wah Mts, Beaver Co. Utah, USA This exceptionally rare stone is a stunning cushion... 72012 Gemstone: Tourmaline - 11.52 Cts. California, USA One of the most popular varieties of mineral, and...Gemstone: Tanzanite - 44.19 Cts. Merelani Hills, Umba Valley Lelatema Mountains, Arusha Region Tanzania The |  | | Journal (issue) | | .......... $1 .00 per lb. Opal, Mexico, black plumes in salmon color opal. ................................................. $.50 per gram Turquoise, Nevada, blue with gray or black matrlx ...................................... $.45 per gram Turquoise, Nevada. green with brown spiderweb .....................- ALL ORDERS MUST INCLUDE A 12.00 r.e ii In the USA - all others including Canada must include lull...to material found at a site near K.a nab, Kane County. Here the s11ndstone is fairly coarse and the colorct |  | | Book | | W©lli� TI� The bustling, dusty town of Coober Pedy. Opal worth many millions of dollars is mined here each...IV 1.OPAL - WHAT IS IT? .......................................... . 2.MODERN HISTORY OF OPAL ........4 3.THE OPAL FIELDS ............ . .. ............................... 7 4.TYPES OF OPAL ............ .......... . ....... ...... 22 8.CUTTINGSEAM OPAL ........... .... . ......... .... ...... . ... ...CUTTINGBOULDER. MATRIX AND FOSSIL OPAL . ... .................. 42 10.THE MAKING OF OPAL DOUBLETS .. ..... ... |  | | Journal (issue) | | Austra\lanBC?.PniUAN FIRE OPAL is Oltly in the red. oran&t. 1 "play o1 f\RE OPAL! ..,... ol brilliant fires...PRICED Al RS pAAAl)ISE and • 3 to 30 each not come to OPAL LOVE our stores. BY IAAIL . . . r II .•t 1ll__!...Conicholcite • sapphire Sond Ulexite Smoky Quorlz Opal Axinite $12.00 postpaid Cholcocite 1 /, " Rutile...Parking for trailers and cars. June 2 thru 4. Natrona County Rockhounds Club. Annual Show. Wagon Wheel Hall...Box 123, MIiis B2644. Dealers. June 3 and 4. Weld County Rock and Mineral Society. Annual Show. Greeley |  | | Book (volume) | | beds, excavations, etc.Selenite roses. BRULE COUNTY AREA: in the Oacoma zone of the Pierre Fm. On Elm...gray Barite rosette up to 5 or 6 inches. CAMPBELL COUNTY MOUND CITY, W to the Missouri R., regional hillsides...tributary gravels, etc.petrified wood, wood opal. CORSON COUNTY LITTLE EAGLE: area ridges, slopes, stream...stream beds, etc. petrified wood, wood opal; along the Grand R. though entire Co., regional banks, breaks...wood, wood opal. 438 A Location Guide for Rock Hounds in the United States CUSTER COUNTY AREA: The |  | | Book | | wood, since the material is no longer wood, but opal, agate, or quartz in one form or another which,...norbergite: Fl bright-yellow to dull buff under sw. opal: green under sw, lesser intensity under Iw. pectolite:...in a dike in a serpentine deposit in San Benito County, California, from which location the mineral takes...associated with zeolites in cavities in trap rock. Nevada, Cali¬ fornia, Michigan, and New Jersey are some...crystals in this country come from St. Lawrence County, New York. Other locations are California, Quebec |  | | Journal (issue) | | 70 lpectrMN Purpur,te R0t1 OuatU Petrolled Wood Opal LepldotI11 (YellOwl Chelll lffpn,1ta Amuon1te Psilometane...MALAYA GEM RHODOLITE PADPARADSCHA TSAVORITE AMETHYST OPAL MORE WITH MIRROR BRIGHT POLISH, READY TO MOUNT...& Bradsireet Ten 6x8 Ovals incl. One Australian Opal . . . . . . . . S 7 47 Ten 10x14 Ovals incl. One...Jasper .... $25 .25 MINIMUM ORDER S18 postpaid in USA Subscribe to our CATALOG of cabochons. beads. slabs...Institution; the Los Angeles County Museum of Natural History; the San Bernardino County Museum; the University |  | | 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) | | three laps. I have cut coru ndum. beryl. garnet, opal. CZ, tourmaline. feldspar , topaz. iolite, spinet...Depending upon yield - 30 to 50% from our rough opal - and your market, profits should not be less than...tting opal for profit. and WISH TO START YOUR OWN BUSINESS ask for our leaflet on how to c ut opal more...2242, NORTH PARRAMATTA 2151, AUSTRALIA SEND ROUGH OPAL TO THE VALUE OF ------------------------------ $...Mexico. * Opal Show Over 30 displays of splendid opals in many forms will be featured at the Opal Show held |  | | Journal (issue) | | pressure Make an Opal Pendant ~ ~--Blue topaz complements ~....J.'...~"-u. 58 blue-green opal by Jennifer...19 OPAL Boulder Opal Pieces-$12.00 each to $200.00 each. per oz. Mine Run Opal (beginners' opal) .....Color reds & greens (large stones) ....$40.00 Mixed Opal (smaller stones) ..............$45.00 Reds in larger...base reds & greens cut good solids .$100.00 Mixed opal good quality ...... . .........$150.00 White base...(large, investment) . . . ..$1,000-$3,000 Black Seam Opal Mintubi . ..$15.00, $45.00, $75.00 $100.00, $250 |
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