 | | Journal (article/letter/editorial) | | as small tabular crystals in the corundum-bearing rock at the corundum deposit near Stocking Meadows, Shoshone...scattered sites near Medeiros Net0 (see fig.) and Cachoeira. In Espirito Santo exceptional specimens have...and in an unusual occurrence in dolomite with corundum at Campolungo near Saint Gotthard, Switzerland |  | | Journal (issue) | | include muscovite in topaz, apatite in spinel and corundum, and biotite in quartz. Conclusion Although the...in Hanoi, one in Ha Nam Ninh Province and another in Hai Hung Province, the latter two are both in the... the area belonging to the 'Eastern pegmatite Province' of Paiva (1946). Outliers of an old peneplain...traps for the chrysoberyl and heavy minerals (Cachoeira do Mato, Types of chrysoberyl deposits in an...FOGO (upper) CORR. DO FOGO (lower) JAQUETO CACHOEIRA ALTA FAZENDA DIMAO DO GIL __________~II';'~'~' |  | | Report (issue) | | sphene, rutile, iron oxides, zircon, sulfides, corundum, annual rainfall ranges from about 1,300 mm in...rise to veins of andalusite-muscovite-quartz and corundum-muscovite-feldspar at a granite contact north...quads; roof pendant in Cachoeira do Campo quad. 2, Nova Lima Group in Cachoeira do Campo quad. 4, Amphibolite...Amphibolite dikes in Cachoeira do Campo, Marinho da Serra, and Congonhas do Campo quads. 75 1, Nova Lima...Grande and Ouro Branco quads; Nova Lima Group in Cachoeira do Campo quad. C24 REGIONAL GEOLOGY OF THE |  | | Journal (issue) | | headed south, toward Ouro Preto, but I got off in Cachoeira do Campo, and then walked down to our meet-up...besidemy lucky spot. As Roberto drove me back to Cachoeira do Campo, we discussed the geology/mineralogy...topaz around Rodrigo Silva. 8 We pulled into Cachoeira do Campo right behind the bus, and soon I was...current understanding of the formation of diamond, corundum, jade, emerald, chrysoberyl, tanzanite, tsavorite |  | | Journal (article/letter/editorial) | | minerals and staurolite supply and use. . . . . . Corundum and spinel . . . . . . . . . . . . . . . . . ...mineralogy of corundum and spinel minerals . . . . 48.2. Magmatic deposits of corundum and spinel minerals...deposits of corundum and spinel minerals . . . . . . 48.4. Metamorphic deposits of corundum and spinel...spinel minerals . . . . . . 48.5. Corundum and spinel supply and use . . . . . . . . . . . . . . . Diamond...Copper Cordierite/iolite Cordylite-(Ce) Coronadite Corundum, sapphire, ruby, padparadscha Corvusite Covellite | | | Journal (article/letter/editorial) | | minerals and staurolite supply and use. . . . . . Corundum and spinel . . . . . . . . . . . . . . . . . ...mineralogy of corundum and spinel minerals . . . . 48.2. Magmatic deposits of corundum and spinel minerals...deposits of corundum and spinel minerals . . . . . . 48.4. Metamorphic deposits of corundum and spinel...spinel minerals . . . . . . 48.5. Corundum and spinel supply and use . . . . . . . . . . . . . . . Diamond...Copper Cordierite/iolite Cordylite-(Ce) Coronadite Corundum, sapphire, ruby, padparadscha Corvusite Covellite |  | | Journal (issue) | | Prêto area, the villages of Antonio Pereira and Cachoeira Do C a m p o . I n Antonio Pereira principally...suration both satisfactorily and accurately. 319 CORUNDUM FROM MALAWI By E. H. RUTLAND, Ph.D., F.G.A. ... T H E existence of gem quality corundum on Chimwadzulu Hill, Southern Malawi, was reported by Dr. K...occurrences in it, with special emphasis on the corundum. Following a market survey production of rough...rough crystals into mountable gem stones. T h e corundum is now being produced and marketed by a n associated |  | | Journal (issue) | | Gracias mine, Diego de Almagro, EI Salado, Chaiiaral Province, Atacama Region, Chile. Don and Laura Aaron photo...photo. Calcite, 3 cm, from Wenshan, Yunnan Province, China. Don and LauraAaron photo. Malachite, 12 cm...Erythrite, 4 cm, from Bou Azzer, Tazenakht, Ouarzazate Province, Morocco. Don and Laura Aaron photo. Supplement...mine, Ruijin County, Ganzhou Prefecture, Jiangxi Province, China. Don and Laura Aaron photo. 14 Supplement...Aragonite, 10.3 cm, from Agrigento, Agrigento Province, Italy. Under longwave ultraviolet light (top |  | | Book | | Read Amber Helen Fraquet Beryl John Sinkankas Corundum Richard W. Hughes Garnet John D. Rouse Jet Hellen...179 Madagascar 180 Mexico 180 Mongolia 181 Mozambique 183 Myanmar 183 Namibia 184 New Guinea 184 Nigeria...later said to be the generic term in Arabic for corundum. There appear to be two problems here. Yakut in...the modern topaz with corundum, although until fairly recently yellow corundum was often called 'oriental...long from the Ribaue-Alto Ligonia district of Mozambique that probably weigh over 100 kg. Rickwood (1981) |  | | Report (issue) | | granodiorite gneiss _. _______ N 280, 3_______ Cachoeira do Campo. 4_-_____. Bacao ___________ N 720, ...do_____________ 105-56_ Nova Lima.. J-37______ Cachoeira do Campo 76____-.. __do_ 82-_____.-___-___do-__-________...bed of the Rio das Velhas, especially at the Cachoeira do Bongo, they found beds of feldspathized quartzite...thin section. Such rocks as sample Ha-3 from Cachoeira do Campo yield mixed K/Ar ages (table 2). They...and earlier formed feldspars. Pegmatites near Cachoeira do Campo are crosscutting and also in lit-par-tit |  | Juliani, Caetano, Rye, Robert O., Nunes, Carmen M.D., Snee, Lawrence W., Corrêa Silva, Rafael H., Monteiro, Lena V.S., Bettencourt, Jorge S., Neumann, Rainer, Neto, Arnaldo Alcover (2005) Paleoproterozoic high-sulfidation mineralization in the Tapajós gold province, Amazonian Craton, Brazil: geology, mineralogy, alunite argon age, and stable-isotope constraints. Chemical Geology, 215 (1) 95-125 doi:10.1016/j.chemgeo.2004.06.035 | Journal (article/letter/editorial) | | high-sulfidation mineralization in the Tapajós gold province, Amazonian Craton, Brazil: geology, mineralogy...June 2004 Abstract The Brazilian Tapajós gold province contains the first evidence of high-sulfidation...Tapajós–Parima (or Ventuari–Tapajós) geological province consists of a metamorphic, igneous, and sedimentary...shallow crustal levels, the discoveries in Tapajós province provide new perspectives for mineral exploration...existence of Fig. 1. Location of the Tapajós gold province and the main geochronological-tectonic provinces |  | | Journal (issue) | | see figure 2). The use of flame-fusion synthetic corundum (both synthetic ruby and synthetic sapphire) was...Johnson R.F. (1962)Geology and ore deposits of the Cachoeira do Campo, Dom Bosco and Ouro Branco Quadrangles...raga, colour. A trade name for reddish-yellow gem corundum, now used more especially for the artificially..."reddish yellow" gem corundum.' In his 1932 edition, by which time synthetic corundum of this color was...indicate that a gem under discussion was in fact corundum, in conjunction with the name of a common stone |  | | Journal (issue) | | and other tour maline was found. Red and blue corundum was discovered in Ankaratra, and kunzite spodumene...part of the Appalachian Uplands physiographic province. The region is chiefly an agricultural one with...Horizonte): At 45.8 km (900 m past the town of Cachoeira do Campo) the Dom Bosco College turn-off leads...townships of Dom Bosco (formerly Hargreaves), Cachoeira do Campo, Rodrigo Silva (formerly Jose Correia)...length, passes near the foot of the Serra de Cachoeira and Morro do Caxambu. More recent research (Pires |  | | Journal (issue) | | Polkanov (1935-2020). coast. They identified corundum, rutile, and titanite for the first time in the...Sphalerite ZnS + Halides Halite• NaCl + Oxides Corundum A~03 Hematite Fe20 3 Hercynite FeA~O, ++...mentioned as pyrite oxidation product 1980). Corundum occurs as colorless transparent and semitrans-...aquamarine crystals from the recent finds in Thanh Hoa Province, Vietnam proved had a truly-impressive selection...from Cabec;a do Cachorro claim, Sao Gabriel da Cachoeira, Amazonas, Brazil (Fig. 3), was one of the most |  | | Journal (issue) | | amethyst, “padparadscha” sapphire, and heat-treated corundum; and of natural and cultured pearls. In the early...well into the next decade. In the early 1980s, corundum treated by heating and diffusion techniques became...explanation of the color of this rare natural corundum. Crowningshield also spearheaded a 1986 article...Schmetzer et al. in a study of corundum dyed to simulate ruby (“Dyed natural corundum as a ruby imitation,” Summer...never encountered this type of inclusion in any corundum, natural or synthetic. Since most inclusions are |  | | Book | | Bosco, Itabira, Miguel Burnier, Antonio Pereira, Cachoeira do Campo) and Bahia (Brumado and Rio das Contas)... the ruby is the most important member of the corundum family. Gem quality is seldomly found, even in...(Jacobina) and Mato Grosso. Opaque pink varieties of corundum are relatively common. Some small gem quality |  | | Journal (article/letter/editorial) | | Mafic-Ultramafic Complexes, western Borborema Province, Brazil: geochemical and isotope constraints for...Mafic-Ultramafic Complexes, western Borborema Province, Brazil: geochemical and isotope constraints for...Mafic-Ultramafic Complexes, western Borborema Province, Brazil: geochemical and isotope constraints for...Pajeú and Piancó–Alto Brígida domains, Borborema Province, Northeast Brazil. Ultramafic lithologies including...of the Zona Transversal Subprovince, Borborema Province; these complexes are host rocks of economic Fe–Ti– |  | | Book | | Aluminum minerals The b:iuxite of the Am:izon Corundum Chrysoberyl and its v:irieties :1lex:1ndrite :ind...bamb11rro of the Lavra do Jonas 577 The Pegmatitic Province of Paraiba, Rio Grande do Norte and Ceara 586...grades from the Archean to the Neoproterozoic: corundum, sillimanite, kyanite, andalusite, staurolite... magn.:tite, diopside, augite, feldspathoids, corundum, barite, fluorite, ran: earth minerals and rare...In 1782, Ma°nuel S. Pereira, authority from Cachoeira, Bahia, (onner Vila de Sao Tiago de Iguape, sent |  | | Book | | & scoria 52 Pyrophyllite 205 217 220 62 Corundum &emery Rare-earth minerals 90 Salt Diamonds...abrasives, for example, have largely replaced corundum and its cohorts. A major movement in the opposite...(amosite of the Transvaal; crocidolite of the Cape Province, South Africa). (4) Serpentinized dolomitic limestone...the north- these (Cilliers, 1964). ern Cape Province (Figure 3). South Africa is the world’s only important...Precambrian Transvaal Supergroup, Northern Cape Province The Transvaal Super-Group, exposed in a broad |  | | Journal (issue) | | energy- that is, the same region of the spectrum-in corundum (Tippins, 1970). Therefore, it contributes a similar...produced by chromium [Cr3+] in beryl [emerald] and corundum [ruby]). The center of the oxygen 3 metal ion...occurring inclusions of rutile and spinel in the corundum dissolve at high temperatures. Fe and Ti from...brown: beryllheliodor (Wood and Nassau, 1968), corundum (Schmetzer et al., 1982), quartzlcitrine, burned...(Mattson and Rossman, 1987b) Fez+- 0 -Ti4+ Blue: corundum (Smith and Strens, 1976), kyanite (Parkin el al |  | | Book | | (Tanganyika), Turkey, 513 Republic, 481 Mozambique, 508 Union of Soviet Socialist (French Morocco)...Laet’s issued an work remarks on more the Province and the Laet, illustration Some information...discussed below. The are Cape St. Helena in the Province of 1783 contained time several However, confusion...figures, did much such to and for remove corundum, as chrysoberyl. and 18th century, the discovery... to F. Ro- C. which he identifies called Corundum.” Fie thus . dismisses emerald when he cites |  | | Book | | inadequately, as ‘the Promontory of Helen in the Province of Manta, Peru’. He also notes the ‘Brazilian...entire Peruvian coast, from Cape St. Helena in the Province of Manta to the Bay of Bonaventura’, and further...beryls and similarly coloured species such as corundum, tourmaline, olivine (peridot), and chrysoberyl...only diamond and ahead of topaz and corundum. However, corundum displays less difference between its...changes in dimensions experienced by diamond and corundum explain why these gems can be safely left in their |  | | Book | | inadequately, as 'the Promontory of Helen in the Province of Manta, Peru'. He also notes the 'Brazilian...entire Peruvian coast, from Cape St. Helena in the Province of Manta to the Bay of Bonaventura', and further...beryls and similarly coloured species such as corundum, tounnaline. olivine (peridot). and chrysoberyl...only diamond and ahead of topaz and corundum. However, corundum displays less difference between its...changes in dimensions experienced by diamond and corundum explain why these gems can be safely left in their |  | | Report (issue) | | Rita Durito Marinho da Serra 33 34 35 36 37 38 Cachoeira do Oampo Sao Bartolomeu Antonio Pereira Casade...as has been observed in laterite in the Surigao province of Mindanao, Philippines, where fragments of serpentinite...300-1,260 million years old. 3. Granodiorite at Cachoeira do Campo 760-720 million years old. 4. Granite...deeply weathered feldspar and blue corundum was found. The corundum is minor in quantity and, although...R. F., 1962, Geology and ore deposits of the Cachoeira do Campo, Doin Bosco, and Ouro Branco quadrangles |  | | Book | | . . . . . 6.4.5 The Namaqua-Natal Metamorphic Province . . . . . . . . . . . . . . . . 6.5 Neoproterozoic:... . . . . . . . . . . . . . . . . . . . 8.8.3 Cachoeira Sequence–Juréia Massif Monazite Ages . . . . ... . . . . . . . . . . . . 18.4.3 The Tocantins Province: Archean Greenstone Belts, Paleoproterozoic Terranes...Craton . . . . . . . . . . . 18.4.4 The Borborema Province . . . . . . . . . . . . . . . . . . . . . . ....Alegre F Congo–Sao Francisco (plus Borborema province) Piquete Formation PF 24 22 10 500 K–Ar |
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Cachoeira, Tete Province, Mozambique