 | | Book | | 8 Front cover: A Spessartite garnet in mica, Madagascar (Sorbonne collection) 0.08 inch. B Tourmaline...state constitutes emery. Only color distinguishes aquamarine, a semi-precious stone, from emerald, which is...rhodochrosite. 10 Amazonstone and smoky quartz, Lake George, Park Co., Colorado (Coil family- Richard...of those rocks. Spine! is frequently found in Madagascar, Ceylon, Australia and Burma. A Spine/, Burma...as disthene. A Garnet, spessartite in mica, Madagascar (0.2 inch) B Garnet, grossularite asbestos, Quebec |  | | Book | | before our very eyes, as a result of deposits in sea, lake and river water, often under the influence of biological...best samples to be found anywhere. 1 - Beryl/Aquamarine (Teofilo-Otoni, Minas Gerais, Brazil): 12 cm...some rare instances (morganite and sometimes aquamarine). It is pure, colorless and transparent; however...probably been in contact with granite seams. The aquamarine variety (sea-blue-green) is less precious. The...with a diameter of between one and two feet. In Madagascar, the extraction of a single beryl crystal left |  | | Journal (issue) | | and star garnet cat's-eyes from Ambatondrazaka, Madagascar Dr Karl Schmetzer 1 , Dr Heinz-Jürgen Bernhardt...properties of star garnets from Ambatondrazaka, Madagascar, are given. All samples examined are intermediate...garnets have been offered in local markets in Madagascar since about 1997. The rough materials for these...of Ambatondrazaka which is located south of Lake Alaotra, about 160 km north-east of the capital Antananarivo...habit of garnet crystals from Ambatondrazaka, Madagascar, showing only the dodecahedron crystal form {110}: |  | | Report (issue) | | The Natural History Museum of Milan and its Madagascar Collection The Museo Civico di Storia Naturale... the museum began paleontologic fieldwork in Madagascar (upper Permian fauna and Jurassic and Cretaceous...fieldwork in Madagascar in 1996 in collaboration with other institu tions in Madagascar, Italy, and the...Pezzotta has spent a total of twenty nine months in Madagascar making geological-mineralogical surveys. In collaboration...both classic and new minerals and gemstones from Madagascar opened at the Natural History Museum in Milan |  | | Catalog/List | | Erongo Namibia Minas Gerais Brazil 54 APATITE Var. Aquamarine. Clear pale blue terminated crystal about 20x3mm...· 868 BISMUTITE Damaraland Namibia 68 APATITE Madagascar Rich yellow mass on matrix with minor CUPRITE...BISMUTOTANTALITE Gamba Hill Uganda 33 APATITE Francois Lake, British Columbia, Canada pure brown cleavage (Carbonate...Cove,Arkansas,USA 579 CO BALTITE Near Elizabeth Lake, 5 miles cast of Espanola,Or Black single crystal...Morbihan, Brinany, France 920 COLLINSITE Francois Lake, British Columbia, Canada Light brown vein with |  | | Catalog/List | | SITE Benallt Mine, Llcyn Wales . . 68 APATITE Madagascar Rich brown mass with approx 5 % Cymrite .Also...····-- ·-- _ _ _ 40 BERYL Erongo Namibia Var. Aquamarine. Clear pale blue terminated crystal about 20x3mm...!:.m £~--- -·· · ·- _ ___ AuTe+Ag 86 CALCITE Madagascar Good sharp dark grey rhombic cleavages lx2£2..._ _ _ _ _F_e_Cr_o_ __ 85 CHRYSOBERYL Lake Alaotra Madagascar Yellow- green small crystal group . !~m-...feldspar. lxl £5 lx2 £8 83 CHRYSOBERYL Lake Alaotra, Madagascar 563 CERULEITE _ Whcal Maid incline of |  | | Catalog/List | | Feldspar lx2 £4 2x2 £8 1119 AXINITE 768 APATITE Madagascar Terminated single brownish -grey crystal good...__________________ Bo_s_o_14_ _ __ 33 APATITE Francois Lake, British Columbia, Canada (Carbonate Fluorapatite)... 5mm £6 BeSiOOH 40 BERYL Erongo Namibia Var. Aquamarine. Clear pale blue terminated crystal about 20x3mm...CHABAZITE . Ramsley Mine, Devon England B6 CALCITE Madagascar Good coverage of white masses with micros on...Beryl BcAIO lxl £4 lx2 £8 CHRYSOBERYL Lake Alaotra Madagascar Yellow- green small crystal group 1cm £6 |  | | Catalog/List | | Palabora Mine, Phalabora, Transvaal, South Afri, Madagascar 29 68 Tem1inated single brownish -grey crystal...x 2 £9 APATITE BARYTES Babbacombc Devon Francois Lake, British Columbia , Canada 33 1 1 27 (Carbonate...lx2 £4 l x l £2 BERYL Erongo Namibia 40 Var. Aquamarine. Clear pale blue tem1ina1cd crystal about 20x3mm...slivery mass on quartz Bi S 8mm £5 ■■ CALCITE Madagascar 86 Good sharp dark grey rhombic cleavages l x2...Feldspar lxl £4 lx2 £8 CELSIAN CHRYSOBERYL Lake Alaotra, Madagascar Benallt Mine, Lleyn, Wales 995 83 pure |  | | Journal (issue) | | Euclase from Brazil Inclusions in Demantoid from Madagascar Photochromism Part 2 Volume 38 / No. 1 /...Demantoid Garnet from Antetezambato, Northern Madagascar—Internal Characteristics and Their Use in Deciphering...2) Photo by J. Štubňa Gem Notes Aquamarine from Manakana, Madagascar | Star Augite from Vietnam | Crocoite...STONES Aquamarine from Manakana, Madagascar Madagascar is well known as a source of aquamarine and other...2022), in early 2021 there was a new find of aquamarine (Figures 1 and 2) that entered the market in |  | | Journal (issue) | | Idria mines (Yugoslavia), Outlaw Seriphos (Greece), Lake George Eugui quarries (Spain) $12 mine (NV), Pribram... v.20/#3 Ouro Preto (Brazil), Anjanabonoina (Madagascar), $12 Port Radium Silver (Canada) $12 v.25/#1...Pieters. At first glance Pieters thought them to be aquamarine, but an analysis identified them as jeremejevite...gem materials, most notably gem tourmaline and aquamarine. During recent years there was a resurgence of...produced in Namibia. The species list now includes aquamarine beryl, topaz, fluorite, cassiterite, tantalite |  | | Journal (issue) | | been found in China, Egypt, the Italian Alps, Madagascar and Mexico. Agate has also been found in parts...garnet are found in Australia, Brazil, India, Madagascar, Sri Lanka and Tanzania. The largest crystals...main amazonite deposits exist today are: Canada, Madagascar, Mexico, Namibia, Russia, Tanzania and Zimbabwe...Mountains of Russia, the islands of Ceylon and Madagascar, and the United States. en -I Above: Amethyst...are found in Uruguay, India, Russia, Ceylon, Madagascar, Italy and the USA. Above: Crystals of amethyst |  | | Book | | 67 60 Danburite Andradite 70 Apatite 70 Aquamarine val Aventurine 73 131 131 131 132 133 ...of the famous intaglio engraved by Evodos in aquamarine. Supposed to represent the Virgin Mary, the original...Garland, J. Amster of the Compagnie Générale de Madagascar, J. Sirakian of the Taillerie de Royat, and S...Chibcha of South America offered gold and emeralds to Lake Titicaca (see EMERALD). Tribal chiefs, priests,...sapphire—are sometimes called ‘‘precious stones’’ while Aquamarine Although flawed and milky, a crystal can still |  | | Book | | known as sapphire and ruby, beryl as emerald and aquamarine, and quartz has dozens of varietal names (Pl...freshwater deposits of iron, known as bog iron ore and lake iron ore. Salt deposits are characteristic examples...Elongated prismatic crysffiis (cp. Fig. 19, p. 133). Madagascar. Formation and occurrence. Two types of deposit...lustrous cube-octahedrons from Leadville district, Lake Co., Colorado. MEXICO - brilliant bluish-silvery...USA - crystals ( ! !) to 5 cm. diameter in quartz, Lake Chelan, Washington. JAPAN - sharp crystals ( ! l |  | | Journal (issue) | | Johne FGA, L Joyner PhD FGA, H Kitawaki FGA CGJ, R J Lake FGA DGA, Li Li Ping PhD FGA DGA, M A Medniuk FGA...colour change behaviour have also been found in Madagascar (M.S. Krzemnicki, pers. comm., 2004). 6 Garnet...non-basalt-related deposits in the Isalo area of Madagascar, from Ratnapura, Sri Lanka and from Mogok, Myanmar...non-basalt-related origin (e.g. from Sri Lanka, Myanmar or Madagascar) is now straightforward. However, distinction...as between Thailand and Australia, or between Madagascar, Sri Lanka and Myanmar – are much more difficult |  | | Book (edition) | | largest crystals are opaque some gem-quality aquamarine and topaz crystals can weigh many kilograms....and tanzanite. Gem minerals such as amethyst, aquamarine, morganite, topaz and tourmaline may be found...as Brazil (Figure 1.29), Madagascar and Sri Lanka, almandine garnet, aquamarine, chrysoberyl, ruby, sapphire...The valley is well known as a source of fine aquamarine and chrysoberyl The first mechanized mining...characteristics may come from East Africa (ruby), Madagascar 37 The Geological Sources of Gems (sapphire) |  | | Book | | have been uncovered in the region of Great Bear Lake in northwest Canada, on the Colorado Plateau, in...United States, the sabi "range" at the for head of Lake Superior, is Megood only another generation or...The helicopter has a tremendous future tle Doctor Lake, Northwest Territories. in the search for minerals...prospector and Canada have numerous pegma- in Madagascar, South Africa, Sweden, and Norway also have a...sand dunes, the desert floor, and dry or temporary lake beds are worthy places for mineral specimens. The |  | | Book (edition) | | granite region; also from Colorado, from Baveno on Lake Maggiore, Italy, the Mourne Mountains of Ireland...are “dry salt lakes” or playas. The famous Searles Lake in San Bernardino is an California, County, ...dendritic masses in pitchblende deposits in Great Bear Lake district, Northwest Territories; wires, and massive...County, and mercury deposits in Sonoma, Napa, and Lake counties, California; also at Idria, Gorizia, ...pegmatites. Massive in pitchblende at Great Bear Lake, Northwest territories, Canada, and in silver-cobalt-nickel |  | | Journal (volume) | | rose quartz comes from Minas Gerais, Brazil; Madagascar; South Africa; and Maine and other regions of...this group were once opal, turquoise, garnet, aquamarine, jade, moonstone, and amethyst and other forms...Mountains of Russia, the islands of Sri Lanka and Madagascar, and the United States. T A magnificent clump...are found in Uruguay, India, Russia, Sri Lanka, Madagascar, Siberia, Argentina, Italy and the USA. • Crystals...gemstone is often used to imitate the precious aquamarine gemstone. Imitation diamond Colourless topaz |  | | Journal (article/letter/editorial) | | Benstonite Berborite Berthierine Bertrandite Beryl, aquamarine, heliodor, goshenite, morganite, rosterite, bixbite...Africa, Great Dyke, Zimbabwe, Muskox, Canada, Dore Lake, Australia, Campo Formoso, Bahia-Brazil) (Barnes...Duluth Complex, USA, Muskox, Nunavut and Crystal Lake, Canada (Barnes and Francis, 1995; Walker et al...Bay and Nicaro, Cuba, Banao, Dominican Republic, Lake Izabel, Guatemala, Loma de Hierro, Venezuela, Cerro...and Augé (1992) from the Manampotsy area, east Madagascar. It is mainly Pt–Fe, Ir–Os and Ir–Ru alloys which | | | Journal (article/letter/editorial) | | Benstonite Berborite Berthierine Bertrandite Beryl, aquamarine, heliodor, goshenite, morganite, rosterite, bixbite...Africa, Great Dyke, Zimbabwe, Muskox, Canada, Dore Lake, Australia, Campo Formoso, Bahia-Brazil) (Barnes...Duluth Complex, USA, Muskox, Nunavut and Crystal Lake, Canada (Barnes and Francis, 1995; Walker et al...Bay and Nicaro, Cuba, Banao, Dominican Republic, Lake Izabel, Guatemala, Loma de Hierro, Venezuela, Cerro...and Augé (1992) from the Manampotsy area, east Madagascar. It is mainly Pt–Fe, Ir–Os and Ir–Ru alloys which |  | | Journal (issue) | | had to go on. GEMS & GEMOLOGY WINTER 2019 Madagascar are from metamorphic deposits, but the deposits...basalts—two very different deposits, yet both from Madagascar. As stated earlier, when geographic origin determination...ring, courtesy of Ronald Ringsrud; a 7.04 ct Madagascar sapphire, courtesy of Mayer & Watt; and an exceptional...such as in Sri Lanka (Ratnapura, Elahera) and Madagascar (Ilakaka), produce the highest-quality sapphires...(Sumjam), Myanmar, Sri Lanka (figure 1), and Madagascar. Sri Lanka is so far the most important producer | | | Book (edition) | | Czechoslovakia. Uranium ores in veins: Example: Great Bear Lake, Canada Gas cavities lined with pegmatitic material:...regions of southern California, Maine, Brazil, Madagascar Syenite Veins: quartz, gold, sulfides. Example:...pyroxenes, copper, nickel, and iron sulfides. Example: Lake Superior region Anorthosite Large coarsely crystalline...and carbonates in playa deposits. Example: Searles Lake, California. Strata and seams: anhydrite, gypsum...Antero-White Mountain, Colorado, from Baveno on Lake Maggiore, Italy, the Mourne Mountains of Ireland |  | | Book (edition) | | solutions, rapid and imperfect gro,vth is likely to Lake place on all cry tal faces. 1\ s noted on previous...Czechoslovakia. Uranium ores in veins: Example: Great Bear Lake, Canada Gas cavities lined with pegmatitic material:...carbonates in playa deposits. Exarnple: Searles Lake, California. Strata and seams: anhydrite, gypsum...Antero-\,Vhite l\llountain, Colorado, fro1n BaYeno on Lake i\faggiore, Italy, the Mourne Mountains of Ireland... and abroad in Brazil, l\1ozambique, Africa, Madagascar, etc. GRANITIC PEGl\lATITE ASSOCIATES Abundant: |  | | Book | | Ontario Silver and Copper lake Superior, Mich. Silverware Copper Crystal lake Superior, Mich. Copper Nugget...South Africa, and Canada. It is also found in Madagascar, Finland, West Germany, Ireland, Australia, Columbia...sulfide), is found only at the Emma Mine, near Solt lake City, Utah, where it is associated with hightemperature...Gangue Climax, Colo. Tungstenite Emma Mine, Salt lake City, Utah DYSCRASITE CRYSTAL (Idealized) Dyscrasite...Ontario Gersdoffite Aloro, Spain Cobaltite Elliot Lake, Onta rio Ullmannite Siegen, We st Germany Corynite |  | Gaines, Richard V., Skinner, H. Catherine W., Foord, Eugene E., Mason, Brian, Rosenzweig, Abraham, King, Vandall T. (1997) Dana's New Mineralogy (8th ed.) Wiley-Interscience. p.1872 | Book (edition) | | Mineralogical Magazine A. LaCroix, Mineralogie de Madagascar, 1922 P. Embry and Fuller Manual of New Mineral...Bow, Madison, and Broadwater Cos., MT; Leadville, Lake Co., Breckenridge(*), Summit Co., Ground Hog mine(*)...Telluride, San Juan Co., CO; Bingham and Tintic, Salt Lake Co., UT; Mohave and Cochise Cos., AZ; Elmore, Idaho...Noranda district, PQ; Porcupine, Kirkland Lake, and Larder Lake deposits, ON; Atlin and Caribou, BC; and...uraninite and nickel-cobalt minerals (Great Bear Lake, Jachymoy). Localities: Only some of the more important |
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Lake Alaotra, Alaotra-Mangoro, Madagascar