 | | Journal (article/letter/editorial) | | 07 January 2015 Goboboseb Mountains Brandberg Region, Namibia BRUCE CAIRNCROSS Department of Geology...Bruce Cairncross Some of the finest prehnite and quartz, including amethyst, in southern Africa has been...the past few decades in the Brandberg region, Namibia. Excellent quartz specimens display a wide variety...that add to the appeal of specimens from the area. The quartz is well known for its luster, clarity, and...phantoms of amethyst and smoky quartz zoned in single crystals. The quartz may contain fluid inclusions |  | | Journal (article/letter/editorial) | | “laws” for quartz are the Dauphiné, Brazil, and Japan laws (not Japanese law, please!). With quartz, twinning...was named) is quoted as stating that an untwinned quartz crystal is one of the greatest rarities of the...Figure 2. Quartz with pseudo Japan-law twinning, 8 cm, from the “Messum Mountains,” Namibia. Smithsonian...Figure 1. Typical appearance of some Japan-law quartz twins (from frondel 1962, p. 95). is the most...explaining the confusion surrounding a specimen of quartz that I observed long ago in the Smithsonian’s vast |  | | Book | | AiAiba / farm Anibib 136 8 Grosse Spitzkoppe, Erongo 9 , .,/, loringa tree . Khomas Highland...station Garub near Aus Nature conservation, Erongo 16 Welwitschia, Goboboseb Mountains 17 ....Northwest Region including Damaraland The Central Namib Desertand Escarpment The Spitzkoppen The Erongo Mountains...The Central Escarpment- The Nauchas-Gamsberg-Hakos Area West and South of Rehoboth The Central and South-CentralDeposits...Copper Deposits The South The Pegmatitesin Central Namibia Luderitz and the Diamonds 44 49 241 254 272 275 |  | | Report (issue) | | CREDITS Cover: Quartz variety amethyst, 10.5 cm tall Goboboseb Mountains, Erongo Region, Namibia Scott Rudolph...collection, Robert Weldon photo © 2009 GIA Page 2 Quartz variety amethyst, 3.5 cm tall Kakamunurle Mine...collection, Marie-Lan Nguyen photo Upper middle: Quartz variety amethyst (Japan-law twin), 1.6 cm tall...Zillertal Anton Watzl, Sr. photo, circa 2004 Bottom: Quartz variety amethyst, 6.7 cm tall Wattika Mine, Murzinka...the word "amethyst" refers to macrocrystalline quartz that is violet or purple and is derived from the |  | | Journal (issue) | | over rough terrain in three 4 x 4 vehicles in Namibia in July. We slept above the ground on camp beds...tourmalines, rose quartz, red garnets, sceptred amethysts and distorted, bent crystals of quartz known as "crazy..."crazy quartz". We also collected some rare minerals: red recticulated rutile, balls of the yellow bismuth.................................. LANZAROTE TO NAMIBIA: Olivine to Shattuckite Plus our advert appeared...were organised , one to Lanzarote the other to Namibia in south-west Africa. Lanzarote is well known to |  | | Journal (issue) | | field divide, so we started out, encouraged by quartz in flints which were sparkling in the sun, including...some localities in the copper, lead, barite mining area in the hills to the south-east of Pontesbury. The...was the Badger Level section of the Huglith mine complex, which was our other location. We were too large...our parking lot just 50 yards from the collecting area - what service! Geologically, this roadstone quarry...specimens as well as micros of prehnite, calcite and quartz. We will have to wait until the competition to |  | | Book | | springer.com To my wife Foreword The Earth is a complex and dynamic system that over 4.5 billion years...papers and 19 geological maps in Western Australia, Namibia and Greenland. Throughout his career, which has...(GSWA) typed most of the tables, especially the complex ones. Jean Johnston and Chris Hocking performed.... . . . . . . . . . . . . . 1.4.8 The Role of Complex Ions and Ligands in Hydrothermal Fluids . . . .... . . . . . . . . . . . . . . . . . . . 1.4.9 Complex Ions in Hydrothermal Solutions . . . . . . . . |
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Messum Crater, Messum Igneous Complex, Brandberg Area, Dâures Constituency, Erongo Region, Namibia