 | | Report (issue) | | Mg2 (Al; Fe3+ )6 Si4 O18 (OH)2 Yoderite ° c 2001 Mineral Data Publishing, ver sion 1.2 Crystal Data:...816(1) c = 7.250(2) X-ray Powder Pattern: Mautia Hill, Tanzania. 3.50 (100), 3.03 (80), 2.61 (60), 2.00...11.83 [2.69] 0.36 [99.99] [99.03] (1) Mautia Hill, Tanzania; Fe2+ :Fe3+ from MÄo ssbauer spectroscopy...talc, hematite, quartz. On Mautia Hill, Kongwa, Central Province, Tanzania. Name: For Hatten Schuyler...D.C., USA. Type Material: Geological Survey of Tanzania, JH 2563/2, JH 2563/14; National Museum of Natural |  | | Journal (article/letter/editorial) | | 282 Yoderite, a new hydrous magnesium iron aluminosilicate from Mautia Hill, Tanganyika. (With Plate...Rhodesia. [Read 6 1N~ovember 1958.] Summary. Yoderite occurs as a maj or constituent in a q u a r t...mineral, occurs in a quartz_][_ yoderite-kyanite-talc schist at Mautia Hill (6~ 889 S., 36~ 29' E.), 6 miles...former Groundnut Scheme headquarters at Kongwa, Mpwapwa District, Central Province, Tanganyika Territory...geology of the district has been described by Temperley (1938), who regarded (p. 40) the yoderite-bearing rocks |  | | Journal (article/letter/editorial) | | 1998, 16, 809–818 A second natural occurrence of yoderite S . P . J OHNS ON A ND G. J . H . OL IV E R *...9ST , UK A B S TR A C T A second example of yoderite has been discovered in whiteschists from the Southern...for the type locality at 2 5.7 0.3 4 18 2 Mautia Hill, Tanzania, i.e. Mg Al Fe Si O (OH) . Textural relationships...of 2 5.6 0.4 4 18 2 minerals suggest that the yoderite was formed by reaction between talc, chlorite...between 13 kbar at 590 °C and 21 kbar at 650 °C. The yoderite-bearing whiteschist is associated with a 1.4 Ga |  | | Journal (article/letter/editorial) | | thomsonite, 506 Berk Hill: apophyllite, 508 Black Cave, Islandmagee: mordenite, 5O9 Carnmoney Hill, Belfast: calcite...lithomarge, xlvi White Mountain: mordenite, 509 Wolf Hill, Legoniel: apophyllite, 508 Tipperary Knockanroe...Knockanroe and Ballygown South mines, Silvermines district: pyrite, marcasite, arsenopyrite, blende, galena, baryte... 136 Shallee and Gortadyne mines, Silvermines district: pyrrhotine, arsenopyrite, chalybite, pyrite,...cryptomelane, 168, 334 Goldongri mine, Panch Mahal district, Gujarat State: blanfordite, manganophyllite, |  | | Journal (article/letter/editorial) | | Accepted Article ON YODERITE: USING CALCULATED PHASE EQUILIBRIA TO INVESTIGATE ITS RARITY IN THE GEOLOGICAL...Adelaide, South Australia 5005 Short title: Rarity of yoderite in whiteschists ABSTRACT A new activity–composition...activity–composition model is presented for green (Mn3+-absent) yoderite for use in the latest internally consistent thermodynamic...this new model we have explored the stability of yoderite in whiteschists, a rare type of high-pressure...in which composition varies, it is shown that yoderite stability is a function of bulk rock SiO2, MgO |  | | Journal (article/letter/editorial) | | Mineralogist, Volume 76, pages 1052-1060, l99I Yoderite, a mineral with essentialferric iron: Its lack...experimental synthesesfrom gels, high yields of yoderite were obtainedalhigh f", only if the gelscontained...tracesof FerO, (as low as 0.0013 wto/o).Synthetic yoderite has between0.01 and 0.72 Fe3*per formula unit...Fe3*pfu are stableat Po: l0 kbar, 750 'C. Synthetic yoderite is monoclinic; all lattice parameters except B...increasing Fe3* contents. In contrast to natural yoderite, the synthetic phaseshowsno indications of Mg |  | | Journal (article/letter/editorial) | | 0022-3530/94 $3.00 Stability of Yoderite in the Absence and in the Presence of Quartz: an Experimental...water-pressure temperature stability field of yoderite, ideally Mg2Al56Feo.^Si4018(OH)2, was determined...quartz, and invariably an excess of hematite. Yoderite was found to be stable over the surprisingly large...upper temperature stability to 715 °C. Two of the yoderite-producing reactions are anomalous as they show...talc + hematite+ H2O = yoderite + quartz which is responsible for the only yoderite occurrence in nature |  | | 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, High–pressure 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 |  | | Journal (article/letter/editorial) | | Austria Synthesis and Properties of Mn-Bearing Yoderite and of Mn-Bearing Kornerupine as By-Product T...28, 1992; accepted February 23, 1993 Summary Yoderite with compositions close to those of the natural...17Si40 lS.20(OH)l.so. Manganiferous, but iron-free yoderite with the formula Mgl.85 (A16.26Mn3+0.10)~:=6...and proves that Mn 3+ alone may stabilize the yoderite structure, although this does not necessarily...purple color of yoderite. Compared to ferric iron, Mn 3+ is incorporated into yoderite in much smaller |  | | Journal (article/letter/editorial) | | f . . . assemblages chlorite-quartz, yoderite-quartz, yoderite-cordierite, cordieritec o r u n d u m...assemblages of whiteschists include the minerals yoderite and cordierite. At still higher temperatures the...by McK1~2 (1959) in the famous yoderite locality Mautia Hill, Tanzania. On the basis of textural evidence...responsible for the formation of yoderite to be talc @ kyanite---> yoderite + quartz. (3) Since kyanite relics...tale invariably separated by yoderite (Fig. 3) are both present in Mautia Hill, this metasedimentary rock |  | | Journal (article/letter/editorial) | | Absorption and M6ssbauer Spectra of Purple and Green Yoderite, a Kyanite-Related Mineral R.M. Abu-Eid 1., K...kyaniterelated mineral yoderite were recorded. M6ssbauer spectra of the purple (PY) and green yoderite (GY) from Mautia...Mautia Hill, Tanzania, show that the bulk of the iron is Fe 3+ in both varieties, with Fe2+/(Fe a+ +...spin-forbidden dd-transitions. 1. Introduction Yoderite, which is structurally related to the important...(1959) in a quartz-kyanite-talc schist at Mautia Hill, Tanzania. This iron and manganese bearing variety |  | | Journal (article/letter/editorial) | | its former existence in the yoderite-bearing schist of Mautia Hill, Tanzania, had been deduced petrographically...Afghanistan ages [ 11 ]. This indicates that the region was affected by several orogenetic events. The...examples of similar chemistry the rocks from Mautia Hill, Tanzania [7], and the ThorOdin Dome, British Columbia...e Sang rock which it has in common with the Mautia Hill occurrence is the close association of the talc...indication for high oxygen fugacities as reported for Mautia Hill [7] and recently also for the Zambia talc-kyanite |  | | Journal (article/letter/editorial) | | Reassignment of the Absorption Spectra of Purple Yoderite K. Langer ~, G. Smith *, and U. Hgtlenius e Institut...Lfilea, Sweden E | | Journal (article/letter/editorial) | | environment. The yoderite-bearing talc-kyanite-quartz schist from Mautia Hill, Tanzania (McKie, i958 )...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 (chapter) | | The present-day Gregory Rift Valley in northern Tanzania is an elongate north–south 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 –southtrending 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 |  | Muhongo, S., Kröner, A., Wallbrecher, E., Tuisku, P., Hauzenberger, C., Sommer, H. (2001) Cross-Section Through the Mozambique Belt of East Africa and Implications for Gondwana Assembly. Gondwana Research, 4 (4) 709-710 doi:10.1016/s1342-937x(05)70506-2 | Journal (article/letter/editorial) | | Department of Geology, University of Dar-es-Salaam, Tanzania, E-mail: muhongo@udsm.ac.tz lnstitut fur Geowissenschaften...the best exposures are in East-Central, and NE-Tanzania (Uluguru-, Pare-Usambara mountain ranges); and...granulite-facies rocks of eastern and north eastern Tanzania (Muhongo, et al., 2001). Gneisses (ca. 800°C/10...Ophiolite Complex in the Kenya/ Ethiopia border region. The original gabbro in this complex crystallized...Neoproterozoic high-grade terrains in eastern Tanzania (Maboko, 1995; Muhongo et al., 2001) and central |  | | Journal (article/letter/editorial) | | Three Structurally Related Minerals: Kyanite, Yoderite and Staurolite A. Lefebvre Universit~ des Sciences...microscopy in yoderite and staurolite. Abstract. The structures of kyanite, yoderite and staurolite...(Lefebvre and M~nard 1981): the Introduction Kyanite, yoderite and staurolite are structurally closely related...dislocations are arrowed B Idealized (010) projection of yoderite. The heights of the ions are indicated as in A... 252 Fig. 2. Dark-field electron micro graph of yoderite g = 0 2/3 1/2 (one satellite of the absent reflection |  | | 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 |  | Grew, Edward S., Pertsev, Nikolai N., Vrána, 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 Lu®lian Arc, Zambia do textural relationships...assemblage has also been reported from Mautia Hill, Tanzania (P £ 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) | | compounds (staurolite, siderite, enstatite, berlinite, yoderite, acmite, and andradite). The pre-edge spectra...Based on theoretical calculations of the EXAFS region, Fe(III) appears to be located in the 5-coordinated...[4]Fe(III); synthetic], a yoderite [>99% [5]Fe(III); from Mautia Hill, Kongwa, Tanzania], an acmite (>99% [6]Fe(III);...Energy steps of 2.5 eV were used for the post-edge region (7150±7350 eV). Pre-edge and XANES spectra were...size. They contribute dominantly in the edgecrest region (features B, C, D, and E). The convergence of the |  | | Journal (article/letter/editorial) | | fO2 enlarges the stability field and stabilizes yoderite. Thus, the scarcity of whiteschist is not necessarily...excess), we added yoderite to the dataset, which was fitted to the database. The yoderite used in the calculations...fitted to the experimental data for the reaction yoderite ? quartz = talc ? kyanite ? hematite ? H2O, by...1989) calculated with O, H2O and SiO2 in excess; yoderite-bearing whiteschist assemblages are marked in...in light violet color and nonwhiteschist yoderite assemblages marked in red color; legend see Fig. 1 Fig |  | | Journal (article/letter/editorial) | | coll. 78123) (Harker coll. 78125) 14. Mautia Hill, Tanzania (McKie 1963) 15. Labwor Hills, Uganda (coll...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...into this structural category), and a two-phase region appears to exist between these extremes. Very Fe3+-rich |  | | Journal (article/letter/editorial) | | novi was his new mineral, yoderite. He was not in fact the rst to see yoderite so spectacular a mineral...Duncan proved his point. The masterly study of yoderite, in which he deduced its high pressure character...studies of minerals from the sole yoderite occurrence at Mautia Hill, on order-disorder in sapphirine...petrologic study, however, was never completed, Mautia Hill having become a centre for insurgents soon after |  | Wilke, Max, Farges, François, Petit, Pierre-Emmanuel, Brown, Gordon E., Martin, François (2001) Oxidation state and coordination of Fe in minerals: An FeK-XANES spectroscopic study. American Mineralogist, 86 (5) 714-730 doi:10.2138/am-2001-5-612 | Journal (article/letter/editorial) | | Alm49Pyr39Spe1Gro11. References Pabst 1959 Alexander 1989‡ Hill 1984 Harrison et al. 1998 Stephenson and Moore 1969...al. 1982 FePO4 yoderite (Mg,Al,Fe)8Si4(O,OH)20 6.1 5 C3v Mautia Hill, Kongwa, Tanzania Fleet et al. 1962...(7050–7300 eV), with 0.1 eV steps for the pre-edge region (7108–7116 eV). Some spectra presented here (as...absorbance by fitting the spectral region from 7050 to 7090 eV (the region before the pre-edge) using a Victoreen...average absorption coefficient of the spectral region from 7200 to 7300 eV (i.e., after the edge crest: |  | | 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 |
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Mautia Hill, Kongwa, Kongwa District, Dodoma Region, Tanzania