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| : 10.3749/canmin.46.1.139 THE FORMATION OF PRECIOUS OPAL: CLUES FROM THE OPALIZATION OF BONE Benjamath...Department of Mineralogy, South Australian Museum, North Terrace, Adelaide, South Australia 5000, and School of...University of Adelaide, Adelaide 5005, South Australia, Australia Abstract The composition and microstructure...opalized saurian bones (Plesiosaur) from Andamooka, South Australia, have been analyzed and compared to saurian...geological formation, north of Coober Pedy, South Australia. Powder X-ray-diffraction analyses show that |
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| 99, pages 1488ā1499, 2014 Australian sedimentary opal-A and its associated minerals: Implications for...Abstract The vast majority of precious opal on the world market comes from opal fields in the Great Artesian...Artesian Basin of Australia pointing to very special prerequisites for amorphous silica to consolidate in a way...analyzed 20 opal-A samples from the Andamooka (South Australia) and Yowah (Queensland) precious opal fields...silica, the mineral assemblage, and the host rock. Opal-A consists of submicrometer-sized silica spheres |
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| 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...two general groups, precious and common. Precious Opal: Any variety of the opal showing a play of color...The term "precious" used in connection with opal does not necessarily infer value, an opal may be of...of the precious variety, yet not gem quality, and vice versa. Common Opal: Any variety of opal which has |
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| lithologies of the Great Artesian Basin (central Australia). Our multi-method approach, using optical and...reveals that particle morphologies trace the flow of opal-forming colloidal suspensions and document syn-...clastic sediments. Keywords: silica; opal-A; common opal; precious opal; silica colloid; photonic crystal;...interface-coupled dissolution-precipitation; Australia 1. Introduction The hydrated mineralogical assemblages...assemblages of the Great Artesian Basin (central Australia) record the acidic oxidative weathering of volcaniclastic |
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| 03 November 2014 Figure 2. Split pair of boulder opal from Quilpie, Queensland. Specimen is 4.5 Ć 3.5...Cretaceous Griman Creek Formation, Lightning Ridge, New South Wales. Specimen is approximately 15 cm long. Museum...MINERALS Figure 3. Opal pseudomorph after gastropod from Coober Pedy, South Australia. Specimen is 1.5...of superb precious black opal from Lightning Ridge, New South Wales. D. Barnes, New South Wales Mineral...Mineral Resources, photo. Australian Opal Resources Outback Spectral Fire Downloaded by [UQ Library] at |
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| revise) Ā© 1976, 1985, 1992 Readerās Digest (Australia) Pty Limited Ā© 1992 Readerās Digest (New Zealand)...& Geophysics. Published by Readerās Digest (Australia) Pty Limited 26-32 Waterloo Street, Surry Hills...identification Prospecting for gold Gemstone areas of Australia The collector's gear Polishing and cutting Fossicking...Nor are gold and silver gem mineralsāthey are precious metals. In general, gemstones are special varieties...be classified by the outmoded terms āpreciousā and āsemi-preciousā. Now they are known as gem minerals |
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| mother-rocks and the emerald itselfābeing the most precious product of this contact-metamorphosisābelong to...p. 294 361 OBSERVATIONS ON THE ORIGIN OF OPAL FIELDS by G. F. LEECHMAN, F.G.A. T H E importance...dull. During a recent trip into the centre of Australia the writer was deeply impressed by the advantages...which had been associated with the formation of precious opal, some unusual activity which had not been thoroughly...train to Port Augusta and on to Pimba, thence to Andamooka by lorry and then back via Pimba and Kingoonya |
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| Valuation. Mumme Publications, Port Hacking N.S.W, Australia. Nassau K . (1984) Gen7stone Enhancement. Butterworths...emerald-bearing belts. The main belt runs approximatelynorth-south over a distance of more than 20 km; at its southern...production. For example, the Cr203 content in sample 3B ranges from 0.1 1 to 0.22 and in sample 3L, from 0.05...in the near-infrared, visible, and ultraviolet ranges revealed the same type of absorption spectra for...the Gravelotte mining district in the Transvaal, South Africa) and illustrated by Schwarz (1987) for a |
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| speciļ¬cs of SiO2 modiļ¬cations and varieties (e.g., opal, chalcedony, agate, quartz, amethyst). Following...seifertite, high-pressure silica glass, moganite or opal, are relatively rare in extraterrestrial materials...measurements; see Table S3). The analytical error ranges within 10% of the absolute concentration of the...behavior of trace elements in granitic quartz from South Norway. Contrib. Mineral. Petrol. 2004, 147, 615ā628...geological materials, and is used in numerous industrial fields as a raw material. Mineralogy and the processing |
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| speciļ¬cs of SiO2 modiļ¬cations and varieties (e.g., opal, chalcedony, agate, quartz, amethyst). Following...seifertite, high-pressure silica glass, moganite or opal, are relatively rare in extraterrestrial materials...measurements; see Table S3). The analytical error ranges within 10% of the absolute concentration of the...behavior of trace elements in granitic quartz from South Norway. Contrib. Mineral. Petrol. 2004, 147, 615ā628...geological materials, and is used in numerous industrial fields as a raw material. Mineralogy and the processing |
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| F.G.A. North-West Branch: M. P. Gayton, F.G.A. South Yorkshire & District Branch: M. W. Eldridge, M.B...on synthetic ruby doublets, all the versions of opal doublets, beryl on beryl doublets and some I have...comparatively pure gem varieties, from the broader ranges applicable to the less pure specimens of the mineralogical...zircon and 'low' or metamict zircon have much wider ranges of RI and SG values than are catered for in the...the predecessors of the microcomputer). In other fields, machines and test equipments have been given a |
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| Willy Petersen-Fagerstam 52 A YANK IN THE OPAL FIELDS by J. Edward Warwict NEWS .._ THE GEM MINERALS...here with the Mule Mountains on the East, running South to the Palo Verde Mountains. The western boundary...and evaporates. From the Palo Verde Mountains, South and West, are numerous volcanic flows, chiefly basalt...we set up our camp and prepare to collect in the fields all around us. Several years ago this area was... clear and smoky ROCK CRYSTAL, and other semi-precious stones. Ask for price list and photos. Enclose |
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| F.G.A. North-West Branch: M. P. Gayton, F.G.A. South Yorkshire & District Branch: 1. R. M. Lewis, F.G...branch of mineralogy dealing with the properties of precious stones and had demonstrated a clear way to progress...and simple. Only four gemstones were ranked as 'precious'ādiamond, ruby, sapphire, and emerald, together...rank. The remaining gemstones were labelled 'semi-precious' or 'ornamental' and their naming was largely...been recognized as a 'legal' weight. This, for precious stones and metals, was the Troy ounce which, until |
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| companyāArchon Exploration Pty Ltd, in Perth, Western Australiaāand a director of KWG Resources, Montreal, Canada...he has worked on projects in Australia, Brazil, Canada, India, and South Africa. He has a B.Sc. in geology...used in the exploration for diamond deposits in Australia, Africa, and, most recently, Canada combined...estimates of seismic-wave velocity for different depth ranges. Areas of increasingly high velocity (and probably...part of the continent (Canadian Shield). The depth ranges of maps a and b are shown on the right of the diagram |
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| 90042 Phone (213) 255-1488 lno. DEPT.109 ā” 900 SOUTH ARROYO PARKWAY ā” PASADENA, CALIFORNIA 91109 CARLSBAD...FOR OPAL cunERS Facet Form Opal1 by Alan K. Standard, Jr., F.G.A ....................... 32 Opal Without...Treaaurer 3616 60th Ave. S.W. Seattle, Wa. 98116 SOUTH CENTRAL FEDERATION OF MINERAL SOClmES FIELD TRIPS...Antonio, Texu 71231 Mrs. Vlola Smith, Treeaurer 1215 South 4111 St,..et, Temc,le, Tew 7'501 The Calclte1 of...WAX PEN HAMILTON PENNYWEIGHT SCALE For measuring precious metals. The ful crum action of this precision |
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| TECHNIQUES 58 A Look Inside a Remarkably Large Beaded South Sea Cultured Pearl Laura M. Otter, Ursula Wehrmeister...& Gemology Challenge 66 Lab Notes UV-reactive opal ā¢ Assembled āpearlā filled with wire ā¢ CVD synthetic...effects and rings with rough crystals ā¢ Mexican opal ā¢ Natural-color tanzanite and yellow sapphire ā¢...from India ā¢ Indian ruby mining ā¢ Large oolitic opal block ā¢ Natural pipi pearls from Tahiti ā¢ Polymer-impregnated...Carlsbad, California A.J.A. (Bram) Janse Perth, Australia Benjamin Rondeau Nantes, France Manuscript Submissions |
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| Treasurer 705 John Adams Pkwy.. Idaho Falls, 10 83401 SOUTH CENTRAL FEDERATION OF MINERAL SOCIETIES Offlcera...00 per lb. or $17.50 per 1n lb. AMAZONITE - From South Africa, Is a good quality greenish blue. It will...comesĀ·In mixed sizes only of 1" to 3" diameter from South Africa. Our price Is only . . . $2.50 per lb. Limited...MATERIALS ARE PRE-SIZED AND TUMBLE-READYI Amethyst, Australia, Ilght color .............................................. $1.00 per lb. Opal, Mexico, black plumes In salmon color opal........................... |
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| Treasurllf 8810 37th s.w.. Seattle, WA 98126 SOUTH CENTRAL FEDERATION OF MINERAL SOCIETIES Officers...Correspondence and requests for information to the South Central Federation should be addreĀ»ed to: Mrs. Mignon...exhibited her work in Wisconsin, Illinois, Nebraska and South Dakota. She started her hClbby six years ago, after...diamond saw blades start as thin as 006 1 Ideal for opal 6 S7.75 PLASTIC LAPS Flat as a sheet ot glass and...will take place at the Centennial Coliseum, 4590 South Virginia Street (Highway 395), Reno, Nevada, June |
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| .......................................... 46 SOUTH CENTRAL FEDERATION OF MINERAL SOCIETIES Offlctn...Antonio. Texas 78228 Mrs. Viola Smith, Treasurer 1215 South 41 st Street, Temple. Texas 76501 GEMS I MINERALS... 70001. 1174 FEDERATION SHOWS March 8 thru 10. SOUTH CENTRAL FEDERATION OF MINERAL SOCIETIES. Annual...CORNER OF OUTSTANDING OPALS SPECIAL CUT OPAL PARCEL Rough Black Opal, Rare, new find acooped up by ua and...SPECIAL Green - Orange - Blue Flash Andamooka Opal for Cutting Good Sized Opal Cab9 3ouncN $25.00 FREE AIRMAIL |
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| ...................... ā¢ ...... .......... 42 SOUTH CENTRAL FEDERATION OF MINERAL SOCIETIES Officers...Iba. I NO. 40-400 ....ā¢ Scales for Weighing Precious Metals and Stones ,r-~ ; Iā¢ ., ; NO. 40-452...40-452 \ I PLATFORM SCALE - For weighing precious metals. Pans rest on cabinet top while loading, and...weight 3 lbs. 6 oz. PORTABLE SCALE - For weighing precious metals. Upright support screws into base of case...11 oz. $47.25 POCKET HAND SCALE - For weighing precious metals. Pans 3" diameter, arm has adjusting screws |
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| per lb. NEW! Plume Opal Is another new discovery in Mexico! This beautiful plume opal is hand-selected...sensitive and must be cut w ith special care as any opal. Our price is only . . . $1 .00 per oz. NEW! Turquol... . .... . ... . . . .... . . . . Sl .25 per lb. Opal. Mttlco. blaclc plu11es In sal11on color epal ..................... Sl .00 per az. Allttllyst. Australia. dart ,.,,,, . .. . .. . . . . . .. . ... .. ..... ................................ . .... 33 SOUTH CENTRAL FEDERATION OF MINERAL SOCIETIES A Ring |
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| mounting - 3 for $31 .00. 90. Seā¢ Shell He,rta. From South Sea. Green Conch w / splashes of while. Drilled...Treasurer 3616 60th Ave. S.W. Seattle. Wa. 98116 SOUTH CENTRAL FEDERATION OF MINERAL SOCIETIES CFMS Show...for Weighing Precious Metals and Stones NO. 40-452 PLATFORM SCALE - For weighing precious metals. Pans...weight 3 lbs. 6 oz. PORTABLE SC ALE - For weighing precious metals. Upright support screws into base of case...11 oz. $47.25 POCKET HAND SCALE - For weighing precious metals. Pans 3" diameter, arm has adjusting screws |
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| Treasurer 1054 Cross Street, Ogden, Utah 84404 SOUTH CENTRAL FEDERATION FIELD TRIPS OF MINERAL SOCIETIES... DEPARTMENTS Mrs. Viola Smith, Treasurer 1215 South 41st Street. Temple, Texas 76501 GEMS & MINERALS...Worth. Texas 76108 FEDERATION SHOWS May 5 thru 7. SOUTH CENTRAL FEDERATION OF MINERAL SOCIETIES. Annual...ct.; to 3 ct. S3 ct; to 4 ct. $4 ct. ZIRCCN ā¢- Australia ā¢ Champagne. clean to 5 ct pcs. 40c ct. AQUAMARINE...plastic bogs or ,n corked g loss viols. SIZE: Ranges from 1/ ā¢ ā¢ 2 LABELS: Ea ch specimen wrapped |
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| Thompson .. . .. .. .............................. 44 SOUTH CENTRAL FEDERATION OF MINERAL SOCIETIES Offlcen...Thin-Rim Blade A free-cutting blade for working semi-precious materials with minimal stock removal. Diamonds...lronwood Ads .. South Bend. IN. 10-9 and 10-6. Marie Niebauer, 174 E. Cleveland Rd .. South Bend 46637. Dealers...and 15. South Douglaa Gem ā¢nd Mineral Club and Myrtle Creek Chamber ol Commerce. 1st Annual South Douglas...70 Specimens Purpurlte Rose Quartz Petrified Wood Opal Lepldollte (Yellow) Chalk Nephrite Amazonlte Psilomelane |
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| ............................. 48 FIELD TRIPS SOUTH CENTRAL FEDERATION OF MINERAL SOCIETIES The Fluorescent...Antonio, Texas 78228 Mrs. Viola Smith. Treasurer 1215 South 41st Street, Temple. Texas 76501 DEPARTMENTS Coming...Precision Scale Eliminates The Guess Work For Weighing Precious Metals For Castings No. 40-445 $4.80 Wax Models...SCALES Pocket Stone Scale For weighing diamonds and precious stones. Very sensitive. All parts fit into polished...70001. 11174 FEDERATION SHOWS March I thru 10. SOUTH CENTRAL FEDERATION OF MINERAL SOCIETIES. Annual |
Andamooka opal fields, Andamooka Ranges, South Australia, Australia