 | | Journal (article/letter/editorial) | | Chromite-chlorite intergrowths in peridotite at Chimwadzulu Hill, Malawi H. W. HASLAM Institute of Geological Sciences...intergrown in serpentinized peridotites at Chimwadzulu Hill. The peridotites probably crystallized from...observed chromite-chlorite association. THE Chimwadzulu Hill ultrabasic body (Bloomfield, 1958) lies at...southern Malawi. It covers about 0"7 km 2, and is surrounded by gneisses and schists of the Malawi Basement... commonly with epidote and more rarely with plagioclase, iron oxides, clinopyroxene, clinozoisite, garnet |  | | Journal (issue) | | Natural and heat-treated corundum from Chimwadzulu Hill, Malawi: genetic significance of zircon clusters...gem-quality rubies from the eluvial deposits of Chimwadzulu Hill, Malawi. Zircons and multiphase-diaspore-CO 2...inclusion assemblage may help to distinguish Chimwadzulu corundums from those from other areas, individually...intermittently from the eluvial soils of Chimwadzulu Hill, southern Malawi, since the 1960s. Previous, small-scale...3 Chimwadzulu ruby ~ 2 c o:l .0 0 Ā«'" .0 1 0 200 400 600 800 1.0 B 0.8 Chimwadzulu colourless |  | | Corporate Document | | Republic of Malawi Ministry of Mining Final Report of the Project for Establishment of Integrated Geographic...Development Co., Ltd. dummy Frontispiece 1 Map of Malawi Former capital: Zomba Headquarters of Geological...Lake Chilwa located in the southeastern part of Malawi and Chisi Island: Chisi Island is composed of syenite...Lake Malawi Upper right: Syenite distributed in Chilwa Alkaline Province in the south of Malawi (Cretaceous.............................. 19 3. The Works in Malawi .............................................. |  | | Journal (article/letter/editorial) | | 918 TOPOGRAPHICAL INDEX Puy Forestier, Massif Central, France, basanite, clinopyroxene, titanomagnetite...basalt, ultrabasic xenoliths, I53 Teldes, Massif Central, France, basanite, clinopyroxene, titanomagnetite...Palisse, Allier, zircon, 790 Vernegoux, Massif Central, France, basanite, clinopyroxene, titanomagnetite...pyroxenite, titanaugite, kaersutite, analcime, 611 Malawi Sierra Leone Freetown, magnetite, ilmenite, troctolite...troctolite, 703 Gabon Coast Chimwadzulu Hill, Ncheu, chromite, chlorite, peridotite, 695 South-West |  | | Journal (issue) | | internal characteristics are newly scribed: plagioclase, uraninite, allanite and rutile (?) occurring...occurrences of the mineral (e.g. in Australia, Malawi, Thailand, Cambodia, etc.), often producing too...inclusion. 60X. Fig. 19. Strongly corroded plagioclase inclusion exhibiting rounding and indentation...P3, G4. Plagioclase (SEM, Ca-rich) was often observed, but could seldom be analysed. Plagioclase occurs...Twinning is sometimes present. The colourless plagioclase is most easily identified by its habit - rounded |  | | Journal (issue) | | those in glassāthat is, well spread and with the central b a n d relatively narrow as compared with cobalt...drastically modifying the environment of this arid region. Perhaps it has been this thrust of interest that...that near D o m Bosco and Hargreaves in the Bulho Hill, some blende and sphalerite have been found with...green crystals, that resemble the beryls from the region of Gapelinha, are also found. T h e light yellow...satisfactorily and accurately. 319 CORUNDUM FROM MALAWI By E. H. RUTLAND, Ph.D., F.G.A. T H E existence |  | | Journal (article/letter/editorial) | | Pakistan, anal., opt., 53; Sri Lanka, anal., 541 ; Central Australia, anal., 589 'Alum', Valcano, Italy, anal...lamprophyres, gabbros, clinopyroxene, kaersutite, plagioclase, spinel, 259 Amphibole, see Hornblende, Riebeckite...141 Brochantite, Kirkcudbrightshire, 893 Broken Hill, New South Wales, sillimanite, 3o3; magnesian smithsonite...L.), see HUTCnISON(R.), 153 Champagnac, Massif Central, Prance, leuciterh6nile basanites, 817 CHANG (L...L. Y.), see CHEN (T. T.), 3o7 Charhls, Massif Central, France, leucite rh6nite basanites, 8i7 Charnockite |  | | Journal (article/letter/editorial) | | detailed study of the sapphire occurrence of Kinyiki Hill in SE Kenya by Parkinson Ž1947., the description...blue sapphire and magnesite, is located at Kinyiki Hill just north of Mtito Andei ŽFig. 1.. Roughly a kilometre...Another body, much less well-exposed, occurs at Twandu Hill, north of Makindu ŽFig. 1.. An association of amphibolite...Many authors consider that the complexes of Kinyiki Hill ŽType 1. and of the Taita Hills ŽType 2. should...predominance of blue-green chlorite and a whitish central powdery zone Žhydrargilite or kaolinite?.. Veins |  | | Journal (issue) | | of zircons in heattreated corundum from Chimwadzulu Hill, Malawi, is due to melting and interaction of...were reproducible to within 1 or 2 cm*1. Chimwadzulu Hill, Malawi (Rankin, 2002) show distinctive changes...pale blue/green sapphires from the Chimwadzulu Hill deposit of Malawi. Details of the temperatures to which...and Morelli, 2000). This suggests that in the Chimwadzulu corundum where melt textures are observed, and...Agricola Resources, pic for providing samples from Chimwadzulu. We also thank our colleagues at Kingston University |  | | Journal (issue) | | these gems. 322 Rubies and Sapphires from Winza, Central Tanzania Dietmar Schwarz, Vincent Pardieu, John...āD-TO-Zā DIAMONDS diamonds from the Cape of Good Hope region, and āJagerā for colorless diamonds with strong...the blue region of the spectrum, as it is the absorption area of wavelengths in this region that allows...the 6-watt lamps used in the past. Here, the UV region shows good agreement between the three lamps. Note...that results in an additional emission in the red region between 620 and 700 nm that does not have a noticeable |  | | Journal (issue) | | main shareholders were Anglo-American Group, 45%; Central Holdings, the Oppenheimer family trust, 45%; and...nationās output for resale to cutting operations (Hill, 2008). The State Diamond Traderās office opened...of 2008, the market went into a severe decline (Hill, 2009). Alrosa. After it was requiredānot without...with the opening of a new mine in the Nova Era region and technological developments at established mines...acquisition of the āTsavorite Projectā from Green Hill Mining Ltd. and Figure 11. This 8.72 ct green zoisite |  | | Journal (issue) | | Triplite from Pakistan ā¢ Gem localities in Zambia and Malawi ā¢ Barite āspearsā in fluorite ā¢ Inclusions in Arizona...carats) of peridot rough from the Sapat Valley region of Pakistan was purchased in early 2004. Following...overlap any of the numerous Cr and V peaks in that region. corundum samples (NBeS-1 and NBeS-2). The dominant...but they did show several peaks in the 310ā314 nm region (figure 8) that are due to chromium (NBeS-1) and...small) cuboid opaque diamonds could extend to the central part of the crystals. The East Coast laboratory |  | | Journal (article/letter/editorial) | | 1ā420 by a pilot project on mineral deposits in Central Europe and in the spreadsheet classiļ¬cation scheme...epigenetic and diagenetic mineral deposits in Central Europe . . . . . . . 54. Conclusions ā the importance...numerous and in this context some studies from Central Europe may be quoted as representative of this...on fossil fuels, ore and industrial minerals in Central Europe two separate approaches have been taken...crustal consolidation of what is called today Central Europe: (1) stratabound deposits, (2) thrust-bound | | | Journal (article/letter/editorial) | | 1ā420 by a pilot project on mineral deposits in Central Europe and in the spreadsheet classiļ¬cation scheme...epigenetic and diagenetic mineral deposits in Central Europe . . . . . . . 54. Conclusions ā the importance...numerous and in this context some studies from Central Europe may be quoted as representative of this...on fossil fuels, ore and industrial minerals in Central Europe two separate approaches have been taken...crustal consolidation of what is called today Central Europe: (1) stratabound deposits, (2) thrust-bound |  | | Book | | VULCANICITY AND CONTINENTAL EVOLUTION IN THE BARBERTON REGION, TRANSVAAL 27 M. J. Viljoen and R. P. Viljoen...OF THE KIBARIDE AND KATANGIDE OROGENIC BELTS OF CENTRAL AFRICA 97 L. Cahen OROGENIC AND POST-OROGENIC...PETROCHEMICAL AND TECTONIC RELATIONSHIP OF THE MALAWI CARBONATITEALKALINE PROVINCE AND THE LUPATA-LEBOMBO...geochronology of specific regions such as northern and central Africa (Cahen, 1961, 1963), southern Africa (Nicolaysen...two contrasted portions: (i) the major part of central Tanzania composed largely of granite, granodiorite |  | | Report (issue) | | Southern Wales and Welsh Marches District ā¢ ā¢ ā¢ ā¢ Central and South Midlands District ā¢ ā¢ ā¢ East Anglia and...the lnstitute's advice is sought. Thus, in the Central and South Midlands District, the Redditch New Town...Board have been towards attracting industry to the region, and the area around the inner Moray Firth has...were carried out in 25 countries in south and central America, the Near East, the Far East, Africa and...in reconnaissance in the extremely inhospitable region of Navarino and adjoining islands in the neighbourhood |  | | Journal (issue) | | 1). The recent discoveries of sapphires in the region between Ambilobe and Antsiranana, the former Diego...rocks) of Jurassic age (Hall et al., 1995) at Sibela Hill in the centre of Bacan. During the Middle Miocene...āOlder volcanic rocksā has been reported from the central Kasiruta island (Djaswadi et al., 1990). Figure...volcanic rocks of basalt composition with white plagioclase laths up Figure 3: The massive chrysocolla quartz...matrix which contains abundant microcrysts of plagioclase and clinopyroxene. Microfractures are filled |  | | Journal (issue) | | Breakdown Spectrometer (LIBS), which costs only in the region of US$75,000. The unit does generate circular pits...result of the impactāa question that became the central dispute in the case (Federman, 1998b). The customer...desk-model spectroscope), as well as the broad region of absorption below 500 nm that is responsible...Besides the absorption below 500 nm, there is a region of absorption from 500 to about 620 nm, as well...this 0.28 ct faceted sample results from the broad region of absorption beginning below about 500 nm. Superimposed |  | | Journal (issue) | | Sciences, London . . . . . Geological Survey of Malawi. By R. T. Cannon, BSc, PhD, . . . MIMM,formerly... Illustrations Geological Survey of Malawi Fig. 1. Geology of Malawi: after Geological map of the Federa...DevelopĀ ment, with special reference to East and Central Africa. The guests and delegates were to be invited...from Burundi, Canada, Ethiopia, Germany, Kenya, Malawi, Sudan, Tanzania, UAR, Uganda, UK, USA, USSR and...the earth sciences. Geological surveys play a central role in the process. I conclude by wishing the |  | | Book (edition) | | metamorphism the temperature and pressure conditions in a region may rise greatly over a period of time. A given...gem minerals. Dioriteādark-colored, contains plagioclase feldspar, little quartz, some biotite. Granodioriteālike...syenite and diorite. Gabbroādiorite rich in calcic plagioclase feldspar; contains pyroxenes as opposed to amphiboles...Prussia: Succinite (now U.S.S.R.). Entire Baltic Sea region, including Poland, E. Germany, Norway, Denmark;...Dundas, England; Sardinia; Scotland; Broken Hill, Wales; N.S.W., Tasmania. Morocco: gem crystals |  | | Journal (issue) | | marble (primary, eluvial, and alluvial deposits) Plagioclase, vermiculite, phlogopite, muscovite, tourmaline...(Solesbury, 1967; Zwaan, 1974; HƤnni, 1987) Vietnamācentral, at Quy Chau (Kane et al., 1991; Poirot, 1997)...rock (primary, eluvial, and alluvial deposits) Plagioclase, amphibole, epidote, tourmaline, micas, sillimanite...sillimanite, kyanite (highly variable) Rutile, plagioclase, apatite, zircon, graphite, sillimanite, amphibole...Ochieng, 1991; Levitski and Sims, 1997) MalawiāChimwadzulu Hill (Rutland, 1969; Henn et al., 1990a) Sri |  | | Report (issue) | | DIVISION .i\frican Region 1\sian Region (ļæ½ribhean and l.atin .i\merican Region Pacific Region Photogeology...Survey of Great Britain Southern England and Wales Central and South Midlands District. . . . . . . . East...INVESTIGATIONS OVERSEAS ā¢ African Region . . . . . . . . . . Asian Region . . . . . . . . . . . Caribbean...Caribbean and Latin American Region . . Pacific Region . . . . . . . . . . Photogeological Unit . . . . . . ...the Aptian fuller's earth, Patteson Court, RedĀ hill. 119 page Fig. 1. Availability of one-inch and |  | | Report (issue) | | Southern Wales and Welsh Marches District ā¢ ā¢ Central and South Midlands District ā¢ ā¢ ā¢ ā¢ East Anglia...polarisation surveys for porphyry coppers near Monywa, Central Burma. 2. Securing the detonator to the charge...Unit - Southern Wale'3 and Welsh Marches Unit - Central and South Midlands Unit - East Anglia and South-East...Beds and London Clay a1Ā·e all heavily masked, on hill slopes as well as in the valleys. In contrast, drift...constantly been drawn upon by such organisations as the Central Electricity Generating Board. Deep exploratory |  | | Book | | pigeon's-blood rubies are pried from both soil and central government control. Marvel over India's maharajahs...O ther US corundum localities 473 Bibliography-Malawi 383 M exico 384 Bibliography-Mexico 384 N amibia...nited Kingdom_453 Bibliography-Madagascar 382 Malawi 4 18 4 10 RUBY & SAPPH I RE 18 498 ā¢ INTRODUCTION...and stars. As the sun rose, we descended the final hill into the Kathmandu valley. Paradise lost-paradise...only slightly above the stall speed of a bicycle. Central government policies had so decimated the 1nanufacturing |  | | Book (edition) | | and pressure conditions in a most clearly seen region may in rise greatly over a period of time.... Tonalite Gabbroā diorite rich in calcic plagioclase feldspar; conpyroxenes as opposed to amphiboles...many gem minerals. ā dark colored, contains plagioclase feldspar, will float painite With Pegmatite...(vividness) of the hue increases moving outward from the central axis. Figure 2 shows that the range of chroma varies...Prussia (now U.S.S.R.): Succinite Entire Baltic Sea region, including Poland, East Germany, Norway, Denmark; |
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