 | | Journal (article/letter/editorial) | | replaced by cordierite with or without additional corundum. I. latr~duction Mineral assemblages of aluminium...existence in the yoderite-bearing schist of Mautia Hill, Tanzania, had been deduced petrographically [7]....Afghanistan ages [ 11 ]. This indicates that the region was affected by several orogenetic events. The...addition to this mineral small skeletal crystals of corundum may appear. Although most portions of the kyanite-talc...kyanite by zones of cordierite with or without corundum. The dravites form large porphyroblasts that are |  | | Journal (article/letter/editorial) | | the only yoderite occurrence in nature at Mautia Hill, Tanzania. Preliminary thermodynamic calculations...environment of this kind, yoderite formation in the Mautia Hill whiteschist may have occurred even at constant...McKie (1959) in a 5 m thick schist band at Mautia Hill (Tanzania). This locality within the Proterozoic Usagaran...which it is topotactically intergrown in the Mautia Hill rock. Chains of edgesharing octahedra A(l) run...Kyanite Andalusite Gibbsite Boehmite Diaspore Corundum Spin«l s s MgAI 2 0 4 A1 2 O 3 FIG. 1. Relevant |  | | Journal (article/letter/editorial) | | yoderite was discoveredin 1959by McKie at Mautia Hill, Tanzania, a locality within the Proterozoic Usagarancomplex...composition of the green yoderite variety of Mautia Hill (McKie and Bradshaw, 1966). If one replacesthe...yoderite plus very small amounts of enstatite and corundum. These three phases do not account for the total...synthetic yoderite was always ast,4 | 4 sociated with corundum and enstatite, and in two cases 800 '-' I _t with...seededtwice with natural Fe-bearingyoderite from Tanzania. In this work, the amount of Fe necessaryfor nucleation |  | | Journal (article/letter/editorial) | | amphibolite from the Paleoproterozoic Usagaran Belt, Tanzania Keiko MORI*, Tatsuki TSUJIMORI*,** and Nelson...Geology, University of Dar es Salaam, Dar es Salaam, Tanzania ** We report a newly discovered assemblage of...of the Paleoproterozoic Usagaran Belt, central Tanzania. The amphibolite is characterized by the mineral...Amphibolite, Highâpressure metamorphism, Usagaran Belt, Tanzania INTRODUCTION Occurrence of talc in crustal composition...amphibolite from the Paleoproterozoic Usagaran Belt, Tanzania. The amphibolite is characterized by the mineral |  | | Report (issue) | | or Space Group: X-ray Powder Pattern: Mautia Hill, Tanzania (5H). 2.43 (vs), 1.426 (s), 2.49 (ms), 2...high-grade metamorphism; rarely detrital. Association: Corundum, ferroan spinel, magnetite, ilmenite, rutile,... Ireland. On Mautia Hill, Tanzania. At the Linganga deposit, Njombe district, Tanzania. From Tsaobis...India, at Kajlidongri and Sitapar, Chhindwara district, Madhya Pradesh; in the Nagpur and Balaghat districts...Langenberg, Saxony, Germany. From Inken, Tiovine region, Morocco. In the USA, in the Artillery Mountains |  | Grew, Edward S., Pertsev, Nikolai N., VrĂĄna, Stanislav, Yates, Martin G., Shearer, Charles K., Wiedenbeck, Michael (1998) Kornerupine parageneses in whiteschists and other magnesian rocks: is kornerupine + talc a high-pressure assemblage equivalent to tourmaline + orthoamphibole?. Contributions to Mineralogy and Petrology, 131 (1) 22-38 doi:10.1007/s004100050376 | Journal (article/letter/editorial) | | six localities worldwide, but only at Chilapila Hill in the LuÂźlian Arc, Zambia do textural relationships...assemblage has also been reported from Mautia Hill, Tanzania (P ÂŁ 13 kbar). In order to estimate possible...kyanite. A reaction relating the Mulvoj and Chilapila Hill (Krn + Tlc + Ky + Qtz + Tur) parageneses is calculated...metamorphic pressures estimated for Mulvoj and Chilapila Hill, Krn + Tlc is inferred to be favored by increasing...least one of the phases in the Mulvoj and Chilapila Hill whiteschists (e.g., Krn contains 0.24±0.67 wt% BeO) |  | | Journal (article/letter/editorial) | | (y} \(Ky) \\ / 650 700 750 Temperature ~,(c) Corundum 800 ('C) Fig. 1. Reproduction of water pressure...(1959) in the famous yoderite locality Mautia Hill, Tanzania. On the basis of textural evidence McKw~...separated by yoderite (Fig. 3) are both present in Mautia Hill, this metasedimentary rock represents the first...in the unusual Allalin metagabbro of the Zermatt region, Switzerland. The complex reaction relationships...b y the retrograde formation of cordierite _+ corundum (Fig. 4), is given b y KUI~KE & SCHREYE~ (1978) |  | | Journal (article/letter/editorial) | | spinel-free paragenesis in u magnesian skarn at Mautia Hill, Tanganyika. Another new occurrence in an aluminous...crystallized hSgbomite in magnesium-rich skarns at Mautia Hill, Tanganyika, in the course of which it became...Castor (1) August (1) Perseus (1) Whittles (2) Mautia* (6) Transvaal-A (1) Macon Co. (1) Cortlandt (2)...79538. 6. Mautia Hill, Mpwapwa District, Tanganyika. 88280. 7. Dentz Farm, Letaba district, Transvaal...Galway, Ireland. 88283. l l . Dentz Farm, Letaba district, Transvaal (Nel, 1949). 19629. * Unit-cell dimensions |  | | Book | | GEMSTONES of East Africa Burundi, Kenya, Rwanda, Tanzania and Uganda Bruce Cairncross Published by Struik...resources 12 Burundi 13 Kenya 14 Rwanda 16 Tanzania 17 Uganda 20 Gemological properties 21 A to...through Tanzania, Kenya, Ethiopia and into the Sudan - has blessed East Africa, Kenya and Tanzania, with...starting in what was then Tanganyika ( now mainland Tanzania) and then progressing to Kenya - I am proud to...countries are among the finest in the world. The region and its gems are particularly dear to my family |  | | Journal (article/letter/editorial) | | Based on theoretical calculations of the EXAFS region, Fe(III) appears to be located in the 5-coordinated...grandidierite, coexisting with werdingite, quartz, corundum, hercynite, augitic diopside, and biotite. A piece...biotite, werdingite, ilmenite, hercynite, quartz, corundum, dumortierite, and augitic diopside) was carried...samples still contained inclusions of quartz, corundum, and several other alumino-silicates, but all... a yoderite [>99% [5]Fe(III); from Mautia Hill, Kongwa, Tanzania], an acmite (>99% [6]Fe(III); from Mont |  | | Journal (article/letter/editorial) | | coll. 78123) (Harker coll. 78125) 14. Mautia Hill, Tanzania (McKie 1963) 15. Labwor Hills, Uganda (coll...Abbreviations. cd cordierite, opx orthopyroxene, co corundum, os osumilite, f s p feldspar(s), phl phlogopitic...only; 5 (Val Codera) 2 M and 1Tc peaks; 14 (Mautia Hill) - lTc peaks only; 23 (Mt. Riiser-Larsen) - Diffuse...state in the yellow sapphirine from M a u t i a Hill, in agreement with the Mossbauer data of Bancroft...1979), but other Mossbauer spectra obtained for Mautia Hill sapphirine (Bancroft et al. 1968) and synthetic |  | | Report (issue) | | = 6.715(2) Z=4 X-ray Powder Pattern: Mautia Hill, Tanzania. 2.639 (100), 3.03 (80), 3.37 (60), 2.118... Association: Sapphirine, cordierite, spinel, corundum, tourmaline, grandidierite, dumortierite, kyanite...In Germany, from Waldheim, Saxony. From Mautia Hill, Tanzania. On the Bok se Puts Farm, Namaqualand, Cape |  | | Journal (article/letter/editorial) | | first was discovered by McKie (1959) at Mautia Hill (Tanzania), while the second was discovered by Johnson...green variety is Mn3+absent and found in the Mautia Hill and Chewore Hills whiteschists, with the approximate...purple variety of yoderite is restricted to Mautia Hill whiteschists, differing from green yoderite by...whiteschist. This variety is also reported to occur at Mautia Hill, though yoderite at this locality is predominantly...2] (Table 1). Natural yoderite formation at Mautia Hill was ascribed to the end-member reaction yoderite+quartz |  | | Report (chapter) | | The present-day Gregory Rift Valley in northern Tanzania is an elongate northâsouth half graben flanked...and northern ends, respectively. The northern Tanzania volcanic province is younger overall than the...surface interface between the Archaean rocks of the Tanzania Craton and the north âsouthtrending Mozambique...volcanoes, which overlies cratonic rocks, the Tanzania Geological Survey maps show the volcanic province...Usagara Mountains at the southeastern margin of the Tanzania Craton (Quennell et al. 1956). Such rocks extend |  | | Journal (article/letter/editorial) | | found in new analyses of natural yoderite from Tanzania. In some runs yoderite coexisted with kornerupine...unter derjenigen der natiirlichen Yoderite yon Mautia Hill, Tansania, liegt (dort 0.15 Mn 3+ p.F.E.). In...known from a quartz-kyanite-talc-schist at Mautia Hill, Tanzania, where it forms dark blue porphyroblasts... Indeed a green yoderite variety, also from Mautia Hill, described by McKie and Bradshaw (1966) has Mn-oxides...Abraham (t), Bochum, on a purple yoderite from Mautia Hill, which was dedicated to the second author of |  | | Journal (article/letter/editorial) | | Namaqualand, South Africa Madras, India Vishakhapatnam District, India 7563 89789 86875 b2I 86878 b2 89790 JAS-I...Anth=anthophyllite, Bt=biotite, Cd=cordierite, C= corundum, Ga=garnet, H bl hornblende, I/=ilmenite, Kr=kornerupine...1973). Similar data for a sapphirine from Mautia Hill, Tanzania, were assembled from the works of McKie...sapphirine. It should be pointed out that the Mautia Hill sapphirine is anomalous in that all the Fe 3+...All other sappbirines are P 21/a ture. In the Mautia Hill sapphirine with all Fe 3+ assigned to tetrahedral |  | | Journal (article/letter/editorial) | | dolomite marble and yoderitequartz-talc schist on Mautia Hill, Tanganyika. It has refractive indices a 1-725:j=...transformation of single crystals of partially ordered Mautia sapphirine to single crystals of a defect spinel...heat treatment. A P P H I R I N E occurs at Mautia Hill, Tanganyika, in e n s t a t i t e h o r n b l...exposed ground j u s t n o r t h of the crest of t h e hill. The sapphirinebearing rocks, which are associated...2+ and A13+. The limiting refractive indices of Mautia sapphirine, ~ 1.725J=0.002 and y 1.732=t=0.002 |  | | Journal (article/letter/editorial) | | yoderite-bearing talc-kyanite-quartz schist from Mautia Hill, Tanzania (McKie, i958 ) is, as far as the authors...schist within this unit is on and around Chilapila Hill, 29 ~ 22' E., I 5 ~ 39' S., overlooking the Zambesi...it has not proved possible to return to Chilapila Hill for more detailed sampling. Preliminary information...sediment samples from streams draining Chilapila Hill do not contain any likely minerals besides gedrite...Mg-chlorite-kyanite schist. Talc in the rocks f r o m Chilapila Hill is invariably colourless in thin section and forms |  | | Report (issue) | | Sillimanite, kyanite, cordierite, kornerupine, corundum, surinamite, phlogopite, chrysoberyl, pyroxenes...near Messina, Transvaal, South Africa. In Tanzania, at Mautia Hill. From Waldheim, Saxony, Germany. At Naxos |  | | Journal (issue) | | âSugarcane Emeraldâ from Brazil âą Orange kyanite from Tanzania âą Rare optical phenomenon in play-of-color opal...Dona Dirlam wrote part of her 1992 âGem Wealth of Tanzaniaâ article sitting at my backyard patio table, while...gemological occurrence of pegmatitic gems in the region, as well as research. Based on his decade of experience...of the 21st century was the heat treatment of corundum involving diffusion with beryllium. Stones artificially...Dirlam et al. surveyed the colored stone wealth of Tanzania. Adolph Peretti and coauthors provided the authoritative |  | | Journal (article/letter/editorial) | | kornerupine from Mautia Hill, Province of Ontario Maine, by Finger and Hazen, 1981). Tanzania(l.92wlo/oBrOr...Presentaddress:Departmentof GeologicalSciences, I l0 of the Mautia Hill specimen to take advantage of imBoardmanHall...intensities of 5696 reflections,including hkl and corundum and sapphirine,in a matrix ofcoarse cordierite...B-free kornerupine and those of the B-bearing Mautia Hill' synthetic, and Grenville kornerupine refined...or M2. M4 is occupiedby substantialFe3*in the Mautia Hill kornerupine sample(Moore et al., 1989),whereasM2 |  | | Journal (article/letter/editorial) | | a sapphirine-bearing rock from the Fiskenaesset region, W. Greenland D. ACKERMAND Mineralogisches Institut...chlorite, spinel, sapphirine, rutile, hfgbomite and corundum. H6gbomite forms 200 #m grains often associated...forms rims on spinel and contains relict gedrite. Corundum is intergrown with spinel and sapphirine. Reactions...Sapphirine ~ chlorite + corundum + spinel. 3. H6gbomite --* rutile + corundum + spinel. In some areas...geological map of the NW Angnertussoq area, Fiskenaesset region showing the h6gbomite sapphirine locality. 556 |  | | Journal (article/letter/editorial) | | any sample, nor have we seen hypersthene with corundum. Sillimanite and hypersthene are associated in...sapphirine coexisting with hematite, from Mautia Hill, Tanzania [3] has a high ferric: ferrous ratio and |  | | Journal (article/letter/editorial) | | diffraction patterns of sapphirine. Material from Mautia Hill, Tanzania, had been found by McKie (1963) to display...aenigmatite, Na2F%TiSi602o, re-interpreted the Mautia Hill diffraction behaviour as resulting from intergrowth...Merlino 1973). This has since been observed in Mautia Hill material also (McKie pers. comm. 1985). Merlino's...1 SYN 1 SYN 5 SYN 15 Val Codera, Italy Mautia Hill, Tanzania Naxos, Greece Finero, Italy 1450 ° C, 1...Examined Abbreviations used: cc = calcite; cor = corundum; cpx = Al-diopside; crd = cordierite; dol = dolomite; |  | Grew, E. S., Chernosky, J. V., Werding, G., ABRAHAM, K., MARQUEZ, N., HINTHORNE, J. R. (1990) Chemistry of Kornerupine and Associated Minerals, a Wet Chemical, Ion Microprobe, and X-Ray Study Emphasizing Li, Be, B and F Contents. Journal of Petrology, 31 (5) 1025-1070 doi:10.1093/petrology/31.5.1025 | Journal (article/letter/editorial) | | minerals sillimanite (or kyanite) (e.g., Fig. 1), corundum, sapphirine, or cordierite, whereas only the ...134H 142-1B 142-1C South Africa Zimbabwe Uganda Tanzania Madagascar India East Germany Norway Canada...Ilmemte/hematite Spinel (Spl)/ Hercynite (He) Corundum (Cm) Rutile (Rt) Magnetite (Mag) Zircon (Zm) Other*...Msâmuscovite, Sulâsulfide. Spinel (Spl)/ Hercynite (He) Corundum (Crn) Rutile (Rt) Magnetite (Mag) Zircon (Zrn)...associated minerals. In association with sillimanite, corundum and/or sapphirine (no orthopyroxene), kornerupine |
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