 | | Journal (issue) | | FEATURE ARTICLES Sapphires from the Andranondambo Region, Madagascar Dietmar Schwarz, Eclzehard I. Petsch...Phillips and Anatoly S. Talantsev Opal from Shewa Province, Ethiopia Mary L. Johnson, Robert C. Kammerling...situation at the two main demantoid districts, north and south of Ekaterinburg. The dragonfly pin, platinum...fine sapphires are coming from the Andranondambo region (including the newer Antsiermene area). From all...of gemq~1alitysappl~iresfrom the Andranondambo region o f southern Madagascar have entered the internutionul |  | | Journal (issue) | | Rings in white gold and diamonds with Ethiopian opal center stones by Van Cleef & Arpels. (Photo: Van...Feature 24 24 Wollo Opals – A Powerful Source from Ethiopia Mining 38 Touring Mines in Brazil Gemology 50...expanded its member exhibiting pavilions in this region from two to seven in less than two years. At the...East African geology has placed countries such as Ethiopia, Madagascar, Kenya, Zambia, Mozambique, Malawi...conferences, the nation has become a leader in the region. Times are changing, and more than ever, the ability |  | | Journal (article/letter/editorial) | | minerals Article A Review of the Classification of Opal with Reference to Recent New Localities Neville...Allan Pring 1,2, * 1 2 * South Australian Museum, North Terrace, Adelaide, SA 5000, Australia; neville.curtis@flinders...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 |  | | Journal (issue) | | ROCKS A Fluorescent Exhibit ETHIOPIA’S OPALS Yita Ridge and Welo www.rockngem.com THE DALLAS SYMPOSIUM...grinding and polishing machine, made by Kingsley North available in powder coat paint. Heavy duty construction...grinding and polishing machine, made by Kingsley North available in Stainless Steel. Heavy duty construction...(with motor mount) and 7” high. $995. KINGSLEY NORTH DIAMOND GRINDING WHEELS Metal bonded diamond grinding...List $135.00 117.00 SALE $86.00 86.00 KINGSLEY NORTH DIAMOND BELT WHEELS A resin-bonded diamond belt |  | | Journal (issue) | | ................................. 46 Amazing Yita Ridge and Welo gemstones by Gail O. Clark The Dallas...1987, naming a state rock, Virgin Valley black fire opal precious gemstone, and semiprecious gemstone. The...gemstone is Virgin Valley black fire opal. Although beautiful, this opal is generally unstable. It tends to...reached by a short hike from the next to the upper north switchback on the lower end of the La Luz trail...trail, and soon reached the “next to the upper north switchback”. There was a very faint footpath that |  | | Journal (issue) | | characteristics of the Earth's deep mantle (the region of the earth between the crust and the core), the...the combined effects of rocks between the target zone (area of interest) and the surface; in some cases...cases, it also includes features below the zone of interest. Consider the following analogy. In measuring...lithosphere can be valuable in assessing whether a region might contain diamondiferous kimberlites. Figure...the various thicknesses of the lithosphere under North America, with specific reference to the recently |  | | Book | | Enigmatic Alluvial Sapphires from the Orosmayo Region, Jujuy Province, Northwest Argentina: Insights...and Allan Pring A Review of the Classification of Opal with Reference to Recent New Localities Reprinted...mineralization (veins, pods, metasomatites, shear zone) as well as the type of gem-forming fluids and their...Valley), Brazil (Itabira), Colombia (Coscuez), Ethiopia (Shakisso), Madagascar (Mananjary), Russia (Ural...[15] presented data on another occurrence of sapphires in the same region of the South Urals occurring |  | | Catalog/List | | RUTILATED QUARTZ GROUP Novo Horizonte, Bahia, Northeast Region, Brazil Two large, water-clear prisms of Quartz...HISTORIC AZURITE Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia Now that the fantastically prolific locality..., Guilin Prefecture, Guangxi Zhuang Autonomous Region, China Bright green Pyromorphite crystals stud...found from this locality and it is assumed that the zone has been played out. Good quality specimens, such...Boumalne-Dadès, Ouarzazate Province, Souss-Massa-Draâ Region, Morocco The forbidding Moroccan desert has many |  | | Journal (issue) | | haveproduced some of the finest pearls from this region. However, the value of these fine, dark pearls...in the emerald-rich area near Malysheva, farther north in the Urals. Recent reports have also pointed to...recovered vast amounts of fine, dark pearls from this region. However, years of overfishing inevitably led to...and pearl-oyster trading or in the history of the region itself. Natural pearls of the pearl oyster Pinctada...pearl oyster indigenous to the Baja California region, Pteria sterna, produces smaller but rounder natural |  | | Book (edition) | | Gem ... 259 Introduction and Overview Opal... 271 Chapter 35 Opal. .. 275 Introduction and Overview Tourmaline...the pearl farms of the Tuamotu Islands north of Tahiti, the opal mines of the Queensland outback, the 1nining...Mahenge, Tanzania, together with the discovery in North Vietnam of quantities of a little known variety...visited the spinel n1ines and markets of Luc Yen, North Vietnam. As ahvays the reader will judge the quality...evil eye, or the amethyst two translucent gems, opal and pearl. 16 to ward off drunkenness. In developing |  | | Catalog/List | | Ordovician, Asery Level Formation Wolchow River Region, St. Petersburg, Russia As if it were not enough...natural association. With so many pieces from the North African country having been literally “made in Morocco”...that once lived in fresh water lakes and rivers of North America during the Eocene. The table is sprinkled...prevalent and attractive vertebrate fossils from North America. When a piece really has something special...Formation Niobrara County, Wyoming, USA The Badlands region of the United States is well known to fossil collectors |  | | Book | | of Litchfield, where a mass of white quartz on a ridge had once been mined for quartz, and large ilmenite...localities for good ilmenite crystals exist in the region (Brunet, I 977b ). NEW YORK Amity, Orange County...Discm•t•ries, /960--20/ 5 ONTARIO Bentley Lake Road occurrence, Faraday Township, Hastings County. In fall 1994...site which they called the Bentley Lake Road occurrence, south of Bancroft. Sharp, flattened rhombohedral...specimens have come from an unusual calcite vein-dike occurrence with an exposure very near, indeed on the property |  | | Catalog/List | | the Tsumeb Mine (as well as other mines of the region) were still in production in the 1970s. You will...diamonds. This was definitely not an every day occurrence but a memorable one. In the mid-1970s, Warren’s...Azurite Level 8, Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia If the attachment point on the back of...Spitzkopje, Spitzkopje Area, Karibib District, Erongo Region, Namibia Klein Spitzkopje in Afrikaans means: the...Pseudomorph after Azurite Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia Some of the best things to come from the |
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Yita ridge, Mezezo Opal Occurrence, North Shewa Zone, Amhara Region, Ethiopia