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| AUSTRALIAN f OPALS | _A Field Guide — BEAUTIFUL AUSTRALIAN OPALS A Field Guide LEN CRAM Robert...Pty. Ltd. 26 Harries Road, Coorparoo, Qld. 4151 Australia © Copyright Len Cram 1994 © Photography and text...Opals, , tiful Lightning Ridge, Beautiful Queensland Opals, and Beautiful Opals of the Desert “ISBN...Black Opal. Contents Introduction 5 Opal History 7 Australian Opals 13 Australian Opal Geology...What is Opal? On the Trail 15 17 19 Let’s Go Hunting For Opal! 23 New South Wales Opal Fields Lightning |
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| 99, pages 1488–1499, 2014 Australian sedimentary opal-A and its associated minerals: Implications for...precious opal on the world market comes from opal fields in the Great Artesian Basin of Australia pointing...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...dominant late-stage mineralization leading to precious opal happened at acidic pH. Our findings indicate that |
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| 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...with opal pattern and color. In this extreme close-up of a Lightning Ridge black opal, the field of view...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 |
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| the central activity. As part of this evolution, field trips organised by SMLS became increasingly ambitious...Scotland. Later on, SMLS organised many overseas field trips; to Europe, Siberia, Namibia, the USA & Canada...if I don't collect at least something from each field trip. Thus I have accumulated an eclectic collection...tourmalines are distinctive Photo 6. Pseudomalachite. (field of view 1cm across.) Bampfylde mine, Devon. I was...Pseudomalachite -5- David Alderton Photo 7. Scorodite. (field of view 1.7cm across.) Hemerdon mine, Devon. Collected |
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| 480 La Trobe Street Melbourne, Victoria 3000, Australia Nelson Canada 1120 Birchmount Road Scarborough...Formed from Surface Water: 19 The Opals of Australia PART II Gemstones of Igneous-Hydrothermal Origin...129 The Diamond Deposits of Argvle, Western Australia Index 141 FOREWORD Each gem deposit-whether...agency of surlace waters, focusing on the opal deposits of Australia. Part II of this book is devoted to those... Egypt and the new find at Argyle in Western Australia are used as examples. It is worth noting that |
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| 480 La Trobe Street Melbourne, Victoria 3000, Australia Nelson Canada 1120 Birchmount Road Scarborough...Formed from Surface Water: 19 The Opals of Australia PART II Gemstones of Igneous-Hydrothermal Origin...129 The Diamond Deposits of Argvle, Western Australia Index 141 FOREWORD Each gem deposit-whether...agency of surlace waters, focusing on the opal deposits of Australia. Part II of this book is devoted to those... Egypt and the new find at Argyle in Western Australia are used as examples. It is worth noting that |
