 | | Journal (article/letter/editorial) | | Allan Pring 2, * South Australian Museum, North Terrace, Adelaide, SA 5000, Australia; Neville.Curtis@flinders... Flinders University, Bedford Park, SA 5042, Australia Correspondence: Jason.Gascooke@flinders.edu.au...was undertaken to characterise opal-AG, opalAN (hyalite), opal-CT and opal-C, focussing on the Si-O fingerprint...spectroscopy shows that the three major IR bands of opal are split into transverse optical (TO) and longitudinal...non-destructive delineation of play of colour opals into opal-AG or opal-CT gems. We find that there are no special |  | | 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...Lightning Ridge in New South Wales takes stunning photographs vibrant with opal pattern and color. In...Lightning Ridge black opal, the field of view is approximately 3 mm wide. Opal courtesy Jenni Brammall...RITCHIE 52 An Opal Glossary of Terms BY SI AND ANN FRAZIER BY PETER HUBER 64 Opal from Mexico: Unsurpassed |  | | Book (edition) | | the front cover is a spectacular opal find from Mintabie, Australia, photographed by the author. The...The back cover pictures an opal mouse which was commissioned by and is in the collection of Paul and Bobbi...every new friend adds to my ever-evolving story of opal. I consider this story as a lifetime work still...guess I will just have to keep going back to Australia again and again! The stories contained in this...and I actually went to these places, searched for opal, broke down in our camper, and met many wonderful |  | | Book | | coronet of agate and topaz, Bert Scheps, F.G.A.A. for opal and carnelian jewellery, Harry Pearce for the clock...Printing Co Ltd, Tokyo. National Library of Australia Cataloguing in Publication data Perry, Nance Australian...colourbook series). ISBN 0 589 07012 6. I. Gems - Australia - Identification. I. Perry, Ron.joint author....Gemstones in Alphabetical Order Origin of Coiour - Opal 11 14 - 101 50 Tests for Identification 106...wish to learn about the minerals and gems of Australia. PREFACE gemmologists, mineralogists in a specialised |  | | Report (issue) | | Aitkens • .' ... INTRODUCTION' * "' • ■ ' •• The opal, long in disfavor "because it was considered "unlucky...years. For variety and beauty of color the precious opal:*is without a peer. These colors do not come from...DESCRIPTION AND PROPERTIES Unlike mos"t gem stones, the opal is not crystalline. .It is a solidi fied jelly consisting...together with a certain amount of water. In precious opal the water content ranges from 6 to 10 per cent....compounds, as. well-as bitumens, are present. • • Opal is somewhat soft, the hardness ranging from 5-J- |  | | Journal (article/letter/editorial) | | 1 –9 Published online November 2012 Article Opal, a beautiful gem between myth and reality Franca...artists and the passion of connoisseurs. The term opal is derived from the ancient Greek and underwent...synonyms appear in mineralogy and gemology texts. The opal is frequently mentioned in historical sources of...works of the Middle Ages. In the Roman Age, the opal gem was very much appreciated, considered as a sacred...its commercial value. Beside its decorative uses, opal also assumed roles in short-lived fashions: for |  | | Journal (issue) | | PHONE ( 213) 255-1488 p.■. DEPT. 109 0 900 SOUTH ARROYO PARKWAY O PASADENA, CALIFORNIA 91109 CARLSBAD... Peggy Norton, Secretary 11945 M1gnoll1 Blvd.. North Hollywood, Ca. 11907 Wllllam Tirk, Treaaurer 3944......................................... 50 SOUTH CENTRAL FEDERATION OF MINERAL soc1m11 Offlur■ Vi rgil...Antonio, Tena TIZII Mra. Vlola Smith, lrNllftf' 1215 South 41at Street, Temple, Tex.ea '1l501 GEMi & MINEIIALI.... 10-10 and 10-6. BIii Usrey, 6628 Salida Way, North Highlands, CA 95660. Dealers. demonstrations, field |  | | Journal (issue) | | mmigration Ol ice. Opal Mines, Wbite Cllifs, New South Wales. Oourte8JI Special Opal Nuinber Granite and...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..................... ...Nature, Oc·cune11ce anll U se. By ,John Jfe11111.sr Opal from the Columhin Plateau Basnlt F lows of ,vashington |  | | Book | | varieties, with favorite location of quartz agate, opal wood — collectors. The petrified gems throughout...to acquaint the collector with places all over North America where he can gather his own gem rocks; to... tell about other quartz varieties such as the opal, and petrified wood; and to give him the most complete...with collecting-spots in every state and all over North America, and it is hoped that the book will be enjoyed...indebted, too, to references taken from the great of North America, by John Sinkankas. Several of Chapter | | | Book | | ties and forms of quartz gems other than agate, opal and its varieties, and petrified wood a great favorite...acqt1aint tl1e collector with l)laces all over North America where he ca11 gatl1er J1is o,vn ge1n rocks;...tell abot1t otl1er Cttiartz varieties st1ch as the opal, jasper, ancl petrified wood; a11d to give l1in1...have for111ed more than 900 clubs or societies in North America, where they regt1larly meet to sh1cly rocks...chryso1)rase, tigereye, and common and preciot1s opal. In the gen eral 01)inion of n1ost collectors, chalced |  | | Journal (issue) | | MINERALOGICAL SOCIETIES FIELD TRIPS Rock collecting in North Carolina by James R. Mitchell A way to find placer...at 14,269 feet by Steve Voynick 54 THE MAGDALENA OPAL DISTRICT Gem materials in Mexico by Edgar B. Hey/mun...Treasurer 3724 W. Sounctvlew Dr•• Tacoma. WA 98466 SOUTH CENTRAL FEDERATION OF MINERAL SOCIETIES Robert M. Smith...aelelltional informat ion anel requestt t o the South Centrt.l Federation Transfer Block on cutting...related to them. Volume 3 bers of the Z.N.L.V., the South followed for HEARTS AND PEARS Netherlands Lapidary |  | | Journal (issue) | | each $3.50 each 3 for $8.95 DEPT. 109 □ 900 SOUTH ARROYO PARKWAY □ PASADENA, r.AUFORNIA 91109 CARLSBAD... Peggy Norton, Secretary 119'5 Magnolia Blvd.. North Hollywood, ca. IUIOT Wllllam Tirk, Treuurer 3144...Jewelry by James Wisse ................... 32 SOUTH CENTRAL FEDERATION OF MINERAL soc1mu Offl111• Vlr,ill...Antonio, Texas 7IZII Mrs. Viola Smith, T,...,,., 1215 South 411t Street, Temple, Taxu 71S01 GIMI & MINIIIAU...elephant, line detail. 2" long ...... $12.00 each 32) South Sea Mabe pearla: 12'h - 13mm at Sl.00 pair; 13½ |  | | Book | | Distributed by Crown Publishers, Inc., 225 Park Avenue South, New York, New York 10003 All rights reserved. No...the stratified structure of feldspars. Precious opal exhibits a brilliant play of colours called opalescence...cannot be seen through, eg sulphur, orpiment or milk quartz. Non-transparent minerals - do not transmit...thick plates of rock crystal - a, smoky quartz - b, opal - c, and jasper - d .. ffffJ.t.i1!!}~{{tt1tWiiP{:...displaying numerous microscopic inclusions, such as opal and cordierite. Pearly lustre - typical of transparent |  | | Book (volume) | | LTD. DURBAN : 33/35 Beach Grove AUSTRALIA: BUTTERWORTH & CO. (AUSTRALIA) SYDNEY : 6/8 O’Connell Street...of the Silica Group including Amethyst, Agate and Opal 11 Turquoise and Lapis-Lazuli ize The-Jades...: : : : : . 166 XVI XVII Opal: Cabochon-cut Stones and a Faceted Fire Opal . So Cabochons of Ornamental...interference of transmitted light rays gives to the opal its unique appearance. Reflections from regularly...emerald, sapphire and pearl, with perhaps black opal and alexandrite. All of these are stones in fairly | | | Book | | Distributed by Crown Publishers, Inc., 225 Park Avenue South, New York, New York 10003 All rights reserved....the stratified structure of feidspars. Precious opal exhibits a brilliant play of colours called opalescence...thick plates of rock crystal — a, smoky quartz — b, opal — c, and jasper —d Transparent minerals — when...cannot be seen through, eg sulphur, orpiment or milk quartz. Non-transparent minerals — do not transmit...displaying numerous microscopic inclusions, such as opal and cordierite. Pearly lustre — typical of transparent |  | | Book (edition) | | “‘Adelaide ruby.’”’ Blood-red pyrope (garnet) from South Africa. adularescence (ad’-u-lar-es’-sence). An...jasper chalcedony. Same as jasp- agate. agate opal. See opal agate. agate shell. Same as agate snail, a...objects, which are generally sold as soapstone in North America. Soft (H. 1-3; tured-pearl farming in Mie...color of orangy- as in amber glass and amber opal. amber colophany. Same as amber pitch. amber drop...A reddish brown dis- tillation of amber. amber opal. Brownish-yellow variety stained by iron oxide. |  | | Book (edition) | | 94 Beryl 96 Chrysoberyl 98 Prasiolite 1 Common Opal 1 1 18 154 Nephrite 156 Jadeite 120 Rose...Hiddenite 114 Kunzite 114 Quartz 116 Opal 150 Precious Opal Fire Opal 152 Rock Crystal 116 Smoky Quartz...Brazilian sapphire Ceylonesian diamond Ceylonesian opal German diamond German lapis Gold topaz chalcedony...Bluegreen topaz Pink topaz Blue topaz Colorless zircon Opal-like glimmery moonstone Rock crystal Artificially...Chrysocolla Ekanite Moldavite Obsidian Hiddenite Opal Gaylussite Properties of Gemstones knowledge |  | | Book (edition) | | ruby, emerald, sapphire, pearl, and occasionally opal. The dictionary (Webster's New Collegiate Diction-...that diamond, tuby, sapphire, and emerald are gems. Opal is a gem. So are jade, lapis, garnets and turquoise...are subjective and open to wide interpretation. Opal, a gem, has a hardness of only 5.5 on the Mohs scale...xx), which is really too soft to wear in a ring. Opal is also quite fragile and brittle, and may crack...dehydration. If durability is a major criterion, opal is not a very good gem. Yet it is a gem and has |  | | Book (edition) | | 480 La Trobe Street Melbourne, Victoria 3000, Australia Macmillan of Canada Canada Publishing Corporation...On the commercial side, the Argyle deposits of Australia have become the most important diamond discoveries...ruby, emerald, sapphire, pearl, and occasionally opal. The dictionary (Webster's New Collegiate Dictionary;...the statement that diamond, and emerald are gems. Opal is a gem, as are jade, lapis, garnets, and turquoise...are subjective and open to wide interpretation. Opal, a gem, has hardness of only 5.5 on Mohs' scale |  | | Book (edition) | | 85 Value of Gemstones 126 Tourmaline Group Fire Opal 168 . | 85 Description of Gemstones 130 Spodumene...Zircon Petrified Wood 164 166 Opal Species 190 Azurite Precious Opal 166 —49 Malachite 194 Lesser-Known...Cape-chrysolite Cape-ruby Ceylon diamond } Ceylon opal Copper lapis German diamond German lapis Gold topaz...Green prehnite Pyrope (garnet) Colorless zircon Opal-like glimmery moonstone Azurite Rock crystal (quartz)...Xonotlite amorphous Amber Glass Moldavite Obsidian Opal Petrified Wood Strass x Properties of Gemstones |  | | Book (edition) | | Printing, GEMOLOGICAL INSTITUTE OF AMERICA 541 South Alexandria, Los Angeles 5 1948 COPYRIGHT, 1948...addressed to: The Gemological Institute of America, 541 South Alexandria, Los Angeles 5, California. A diamond..."Adelaide ruby." Blood-red pyrope (garnet) from South Africa. adinol. A silicified porphyry or diabase...generally sold as soapstone trade as Russian lapis. in North America. Soft (H. 1-3; S.G. 2.7-2.9), compact, greenish...West African coast. Red, blue akabar. agate opal. See opal agate. agate shell. Same as agate snail, a |  | | Book (edition) | | Second Edition GEMOLOGICAL INSTITUTE OF AMERICA 541 South Alexandria, Los Angeles 5 1945 Copyright, 1945...addressed to: The Gemological Institute of America, 541 South Alexandria, Los Angeles 5, California. he Companion...“Adelaide ruby.” Blood-led pyrope (garnet) from South Africa. adinol. A silicified porphyry or dia¬ base...objects, which are generally sold as soapstone in North America. Soft (H. 1-3; S.G. 2.7-2.9), compact, greenish...Indian Ocean region. See accarbaar. agate opal. See opal agate. or Aquama¬ a jour together waste |  | | Journal (issue) | | Sotlant.y ad S■11day lno. DEPT. 109 □ 900 SOUTH ARROYO PARKWAY □ PASADENA, CALIFORNIA 91109 CARLSBAD... Peggy Norton, Secretary 11945 Magnolia Blvd., North Hollywood, ca. IUI07 WIiiiam Tirk, TrMIUNr 3144...Antonio, Texu 71211 Mrs. Vlol1 Smith, T,...._ 1215 South 411t Sbwt, Temple, Teua 71111111 OIHI I MINDAI......................................... 34 SOUTH CENTRAL FEDERATION OF MINERAL SOClmEI CALIP., AND QS...70 Specimens Purpurite Rose Quartz Petrified Wood Opal Lepldollte (Yellow) Chalk Nephrite Amazonlte Psllomerane |  | | Book (edition) | | - ae : 126 Tourmaline Group 130 Spodumene 166 Opal Species 170 Jade _ Species 174 Peridot Hiddenite...Cape-chrysolite Cape-ruby Ceylon diamond Ceylon opal Copper lapis German diamond German lapis Gold topaz...Green prehnite Pyrope (garnet) Colorless zircon Opal-like glimmery moonstone Azurite Rock crystal (quartz)...Xonotlite amorphous Amber Glass Moldavite Obsidian Opal Petrified Wood Strass 19 Properties of Gemstones...Hedenbergite 5/%-6% Magnetite 5%4-6% Manganotantalite 5%-6% Opal 5%4-6% Rhodonite 54-6% Actinolite 54-6 Allanite |  | | Book (edition) | | powder for eye shadow? 6. What is the "gold of the North," the earliest used gem material of all? 7. What...Natural orange spine! Opal with one-colored flash Black pearl Fire opal, water opal or n1oonstone Avent...Avent urine glass Fire opal Chlorastrolite Nephrite and chlorastrolite Peridot from Hawaii Aventurine feldspar...Feather gypsun1 Flame spine! Flash opal Giogetto Girasol Goldfluss Gold opal Green starstone Greens tone Hawaiite...pearls Paste Pigeon-blood agate Pipe stone Prase opal Rainbow agate Red Sea pearls River agate River pearl |
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