 | | Catalog/List | | natural crystal formations of emeralds. Important emerald gemstones and jewelry can be found in every gem...same cannot be said about exceptional natural emerald specimens. We estimate that there are less than...having two-thirds of the world’s finest known emerald specimens cannot be overstated. This has never...invites the viewer to experience the wonder that is emerald. 3 The Legend of Fura & Tena The Muzo God...This is the legend of the first emeralds. 5 Emerald on Calcite Coscuez Mine, Muzo Municipality, Vasquez-Yacopí |  | | Journal (article/letter/editorial) | | horizon. Gerhard Louw photo. Figure 2. Map of Nigeria showing the Egbe district (blue) in the northwest...of ferronigerite-2N1S. The Jos Plateau is located primarily in the Plateau district and is famous for...University of Johannesburg. Egbe District Kogi State, Nigeria NIGERITE, an oxide of aluminum, iron, zinc, and...the Egbe district (formerly Kabba Province) in Nigeria (fig. 2) (Jacobson and Webb 1947; Bannister, Hey...with stanniferous pegmatites and was named after Nigeria, the country of its discovery, not to be confused |  | | Journal (issue) | | range of emeralds and green beryls from Central Nigeria. Detailed work on inclusions, compositions of hosts...deposits are exploited, e.g. in Australia, Thailand, Nigeria and China (Coenraads, 1992a; Guo et al., 1992)...on sapphire from other basaltic origins (e.g. Nigeria and Australia). She described as significant morphological...Harding, R.R., 1990. Gemstone prospects in Central Nigeria. Journal of Gemmology, 22, 4,195-202 Karr, c.,...(hereafter designated 'KN'): an 8.75 ct intense blue emerald-cut Maxixe-type beryl, a 1.55 ct greenish yellow |  | | Journal (article/letter/editorial) | | Although overshadowed by diamond and the "big three" (emerald, sapphire, and ruby), topaz is nevertheless regarded...Katlang, Pakistan; 13. Tin granites of Jos plateau district, Nigeria; 14. Namibia pegmatites; 15. Mozambique...Although overshadowed by diamond and the "big three" (emerald, sapphire, and ruby), topaz is nevertheless an...pegmatitic topaz. The tin granites of the Jos Plateau, Nigeria, have produced several hundred kilograms |  | | Journal (issue) | | volume 54, January–February, 2023 Figure 10. Emerald beryl, 5.3 cm, from Laranjeiras, Galiléia, Minas...volume 54, January–February, 2023 29 Figure 29. Emerald beryl with quartz crystals, 4.6 cm, from the Brumado...dumps from the Piraja magnesite pit, so Brumado emerald specimens are quite rare today. Will Johnson collection;...volume 54, January–February, 2023 Figure 114. Emerald beryl with pyrite, 1.9 cm, from the Muzo mine,...54, January–February, 2023 121 Figure 132. Emerald with calcite and pyrite, 2.5 cm, from the Muzo |  | | Report (chapter) | | COMPLEXES IN THE YOUNGER GRANITE PROVINCE OF NORTHERN NIGERIA CONTENTS I. INTSODUCTmN . . . . Page 5 ....19 23 35 42 (d) Rop . . (e) Sha-Kaleri. 9 (f) Jos-Bukuru (g) Banke (h) K u d a r u (i) Ningi . . ....thesis, unpublished). During the resurvey of the Plateau tinfields between 1945 and 1948, R. A. Mackay,...into the PreCambrian Basement Complex in Northern Nigeria. They are high-level, magmatic granites with sharply...There are about forty Younger Granite complexes in Nigeria. Until a complete survey of the province has been |  | | Journal (issue) | | .......................................... 39 Nigeria..................................................Kong; GEA, Brazil; Emmanuel Piat, France; Israel Emerald Cutters Association, Israel; Gemstar, Israel; Tom... Israel; Tom Cushman, Madagascar; Linus Adie, Nigeria; Bill Larson, USA; Veronica Shkarina, Moscow, Russia;...kyanite from Tajikistan has been reported. T Small emerald crystals from Afghanistan. Courtesy Colgem Ltd...learned that these stones were natural and An emerald-cut ametrine. came from near Anahi in Photo: van |  | | Journal (issue) | | 1990,22,4 J. 22,4 Gemstone prospects in Central Nigeria J. Kanis* Kanis* and J. andR.R. R.R. Harding**...mining activities activities in central central Nigeria Nigeria are briefly described.Aquamarine Aquamarine...discoveries discoveries in in Central Central Nigeria Nigeria reached reached the outside of the the eighties...world and and by by the the middle middle of Nigeria of Nigeria had had become become an an important important...Sketch map map of part of Plateau and Kaduna States, States, Nigeria; Nigeria; location of places mentioned |  | | Journal (issue) | | they discuss colour causes and quote 'normal' emerald and its chromium content. Zambian emeralds, they...'With the chromium we felt it had to be considered emerald'. This is what I consider to be an unsolicited...testimonial to the 'chromium as a criterion for emerald' cult from a source which does not normally subscribe...(with the desire to give them the accolade of emerald), to me is a bete noire. Being free or far from...small fragments of actinolite. The actinolites are emerald green, due to a small chromium content and resemble |  | | Journal (article/letter/editorial) | | consistent with a sedimentary source origin. Type IA emerald REE patterns have upturns in the heavy REE (La/YbCC...occurring in Archaean host rocks. Modeling of type IA emerald compositions indicates that they form from magmatic...crustal protoliths. This geochemical signature links emerald formation with continental suture zones. Diamonds...indicating that plate tectonic processes have led to emerald deposit formation since at least the Archaean....that is responsible for the vivid green color of emerald [2]. Emeralds are scarce commodities requiring |  | Melcher, Frank, Graupner, Torsten, Gäbler, Hans-Eike, Sitnikova, Maria, Henjes-Kunst, Friedhelm, Oberthür, Thomas, Gerdes, Axel, Dewaele, Stijn (2015) Tantalum–(niobium–tin) mineralisation in African pegmatites and rare metal granites: Constraints from Ta–Nb oxide mineralogy, geochemistry and U–Pb geochronology. Ore Geology Reviews, 64. 667-719 doi:10.1016/j.oregeorev.2013.09.003 | Journal (article/letter/editorial) | | al. 4.4.4.2. Mineralogy 4.4.5. Older Granites (Nigeria) 4.4.5.1. Radiometric data T 4.4.5.2. Mineralogy... Madagascar 4.5. Mesozoic SC R 4.5.1. Jos Plateau (Nigeria) 4.5.1.1.Radiometric data 4.5.1.2. Mineralogy...Older Granites (Nigeria) 5.4.6. Madagascar 5.5. Mesozoic 5.5.1. Jos Plateau (Nigeria) 6. Mineral chemistry...Congo), the Kamativi Belt (Zimbabwe) and the Jos Plateau (Nigeria). Mn-rich columbite-tantalite is typical...pegmatites associated with the Older Granites of Nigeria and some pegmatites in the Damara Belt of Namibia |  | | Report (issue) | | our way through the compet itive minefield of emerald science, much of John's contribu tion to this...any other opinion. extraLapis English No. 2: Emerald The Most Valuable Beryl The Most Precious Gemstone...we • pay tribute to John Sinkankas to whom this emerald issue is dedicated. John Sinkankas wrote more...than 15 books including his 1981 definitive work Emerald and Other Beryls. He set standards for authors...Gloria & Gunther A 2001 Find of top-quality emerald crystals from La Pita at Maripi, Boyac |  | | Journal (article/letter/editorial) | | beryl in the vivid green variety that we call emerald. Supply car avans took the produce of the mines...Among all minerals and gemstones, beryl in its emerald variety thus became one of the earliest to be recognized...ravages of time. It is probable that mining for emerald commenced as early as twenty-five hundred years...January/February 1988 11 Figure 4: Left, Patricia Emerald (629 carats) from the Chivor mine, Colombia. Main...tall; A M N H G42027. Right, Schletter Engraved Emerald, 87 carats. Ornate design thought to have been |  | | Journal (article/letter/editorial) | | red-brown to pale wine- or honey-yellow color. Rarely, emerald-green zircon crystals are found at this location...pegmatites associated with albitites of the Jos Plateau and from near Korot, and excellent gem zircon...associated with sapphire is mined at Antan, Kaduna, Nigeria. Beautifully limpid, orange-red faceting rough |  | | Catalog/List | | online, visit HA.com/5236 57049 Emerald Cobra Pit, Gravelotte Emerald Mine, Murchison Range, Limpopo Province...are both from the Cobra Pit of the Gravelotte Emerald Mine in South Africa. One is a chunk of the typical...crystal with but traces of matrix, that is medium emerald green, quite transparent and glassy in luster....other than the reinforcement. Measurements of the Emerald crystal: 1.7 x 0.5 x 0.4 inches (4.2 x 1.2 x 1...com/5236 57053 Tourmaline Keffi, Nassarawa State, Nigeria Suffering from a bit of alluvial wear, this 4.7 |  | | Journal (article/letter/editorial) | | formed by headward erosion of the river into the plateau of layered basalt. Herman du Plessis photo, December...Drakensberg formations Beryl, variety Emerald, Jos, Plateau, Nigeria Doubly Terminated and 2.5 inches (6 |  | | Report (issue) | | Arizona> NewsNLexicoe se ete eaten en Colorado Plateau: sijcsces etn Sas tes aa ee Southern Ilinois fluorsparasaqs...Bull. no. 31, 94 p. (gold) Ball, C. W., 1954, The Emerald, Feeney and Dodger tungsten ore-bodies, Salmo,...eCRIPPLE Sada (eSAN JUAN LA PLATA “COLORADO PLATEAU __—_. eGOODSPRINGS e JEROME MAGMA GLOBE o.°...Surv. Prof. Paper 258, 303 p. COLORADO, Colorado Plateau UTAH, ARIZONA, NEW (Uranium, Vanadium) MEXICO...Uranium-bearing sandstone deposits of the Colorado Plateau: Econ. )Geol., v.45, /p 4-11 . Fischer, R. P. and |  | | Book | | Mauritania Mauritius Morocco Mozambique Namibia Niger Nigeria Reunion (France) Rwanda São Thomé & Príncipe Senegal... Guinea, Guinea-Bissau, Ivory Coast, Liberia, Nigeria, Rwanda, São Tomé and Principe, Sierra Leone, Somalia...12°N E W BURKINA FASO S 50 0 50 100 km NIGERIA 10°N 10°N 4°E Parakou CENOZOIC Mostly alluvial...E W S 10°N 10°N CHAD 100 0 100 200 km NIGERIA Lake Mbakaou Lake Bamendjing CENTRAL AFRICAN...continuous sedimentary basin that stretched from Nigeria to southern Cameroon from Cretaceous to Miocene |  | | Book | | Mozambique 183 Myanmar 183 Namibia 184 New Guinea 184 Nigeria 184 Northern Ireland 186 Norway 186 Pakistan 186...Brazil; Rhondonia state, Brazil, Sri Lanka; Jos plateau, Nigeria; Volyn district, Ukraine, and numerous pegmatites...neighbouring topaz deposit in Egypt, near the emerald mines of Jebel Zabara, which were exploited from...stones (Ashbee, 1888). These are ruby, sapphire, emerald, and diamond, each correlated to the four elements...topaz, being more typical of that contained in emerald (Sinkankas and Read, 1986). Traces of chromium |  | | Journal (article/letter/editorial) | | is generally white, lemon-yellow, or rarer yet, emerald-green” that “could be used in jewelry, although...Spodumene (kunzite), 5 cm across, Jos Plateau, Jos State, Nigeria. William F. Larson specimen. 128 ...finest mineral specimens of any kind ever found. Nigeria A small find of probably hundreds of specimens...come from a locality between the towns of Jos and Ibadan, Nigeria. About one hundred specimens to 10 cm long...Nostrand Reinhold. Smith, J. L. 1881. Hiddenite, an emerald–green variety of spodumene. American Journal of |  | | Journal (issue) | | & Dawn Minette collection. Jeff Scovil photo. Emerald beryl, 3.8 cm, Cosquez mine, Muzo, Boyaca, Colombia...- - - - - - - - - - Emerald beryl, 2.6 cm, Jos Plateau, Plateau State, Nigeria. Jeff Scovil photo. ...2009 81 ROB LAVINSKY COLLECTION Emerald beryl, 6.7 cm, Jos, Nigeria (1991 pocket). Joe Budd photo. Tourmaline...January-February, 2009 99 WALL Y MANN COLLECTION Emerald (beryl) on calcite, 3.5 cm, Coscuez mine, Boyaca...January-February, 2009 109 MARK POSPISIL COLLECTION Emerald beryl, 8. 7 cm, Coscuez mine, Muzo, Boyaca district |  | | Journal (issue) | | tourmaline, (11) 2.16 ct demantoid, (12) 1.05 ct emerald, (13) 1.99 ct red beryl, (14) 0.72 ct ruby, (15)...available. Or the devastation inflicted on the emerald market when the stability of new and even traditional...and Vietnam), Africa (Tanzania, Kenya, Zimbabwe, Nigeria, and Namibia, as well as Madagascar), South America...from southern Tanzania; spessartine garnet from Nigeria and Namibia; exceptional peridot from Pakistan;...Pakistan; and pink to red tourmalines from Nigeria and Brazil. Diamond was mined in northern Canada for the first |  | | Journal (issue) | | 'Red' 'Garnet' 6.00 Cushion cut 'Red' 5.05 Emerald cut 'Blood red' 5 5 3.98 Not reported Round...86 0.02 •0.10 0.3 0.34 0.1 0.05 Cobalt blue Emerald green Aquamarine pale blue 69.1 2.6 0.05 0.06...Blue-green 'Aquamarine' Chromium 0.2% Cr + 0.1% Cu 'Emerald' Green** Cobalt 0.05% Co + 0.4% Cu 'Amethyst' Blue-violet**...change in natural and Radiation-induced synthetic emerald Dr Karl Karl Schmetzer Dr Schmetzer Marbacher Str...with low thennal thermal stability is emerald by X-rays, gamma emerald gamma rays, electrons and in in hydrotherproduced |  | | Journal (article/letter/editorial) | | area/Colorado (Gross and Heinrich, 1966), Jos Plateau/Nigeria (Williams et al., 1956), Miask/Russia (Palache...Giuliani, G., Yardley, B.W.D., Cheilletz, A., 2000. Emerald mineralisation in Colombia: fluid chemistry and...the decomposed columbite-bearing granites, Jos Plateau, Nigeria. Economic Geology 51, 303–322. Wood, S.A |  | | Book (edition) | | resinous.streak white. H = 5. D = 3.73. Np,m,g = Plateau, Zomba ...Gwinear.bothCornwall.EngJand,at Lavrion.Greece. Plateau,Sakha, Siberia, Russia, and in the Dara-i-Pioz...on Grossgreiner and Schwarzenstein Mt., the Jos Plateau.!\igeria. both overlookingZillertal Valley, Tirol...anatase occurs in the Druzhnoye deposit. Aidan Plateau. Sakha. Siberia. Russia. The most important anatase...29(6) - 3.12(8) - 3.06(10) - 2.81(4) - 2.47(6). As emerald green micro. crystals, cleavage {100} and {010} |
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Jos Plateau, Plateau, Nigeria