 | | Journal (article/letter/editorial) | | hydrous magnesium iron aluminosilicate from Mautia Hill, Tanganyika. (With Plate XI.) By DUNCANMcKm,...a quartz_][_ yoderite-kyanite-talc schist at Mautia Hill (6~ 889 S., 36~ 29' E.), 6 miles north-east of...former Groundnut Scheme headquarters at Kongwa, Mpwapwa District, Central Province, Tanganyika Territory...Territory. The general geology of the district has been described by Temperley (1938), who regarded (p. 40)...petrology of Mautia Hill is in course of preparation by the author and J. R. Harpum. Mautia Hill is an east-west |  | | Journal (article/letter/editorial) | | chlorite, kyanite, talc, staurolite, pyrope, enstatite, boron-free kornerupine, cordierite, quartz, and...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 |  | | 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...all cases,yoderite plus very small amounts of enstatite and corundum. These three phases do not account...I, but the result was also negative, yielding enstatite * kyanite * staurolite, just as for the experiment...was always ast,4 | 4 sociated with corundum and enstatite, and in two cases 800 '-' I _t with additional |  | | Journal (article/letter/editorial) | | metamorphism [ 1]. As examples the assemblages kyanite-enstatite [2], sillimanite-orthopyroxene [3], and sillimanite-gedrite...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...to light olive green interlocking prisms. (4) Enstatite roeks consisting of an aggregate of very light...examples of similar chemistry the rocks from Mautia Hill, Tanzania [7], and the ThorOdin Dome, British Columbia |  | | Journal (article/letter/editorial) | | Mg-silieates are tale, 599 Au~e gedrite ~), and enstatite. A l o w e r i n g of pressure b e l o w the critical...(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...(Ky). Q = quartz. Parallel nieols. - - Mautia Hill, Tanzania. Specimen courtesy of D. McKIE. Fig. 4 |  | | Journal (article/letter/editorial) | | Fe(III) model compounds (staurolite, siderite, enstatite, berlinite, yoderite, acmite, and andradite)....Based on theoretical calculations of the EXAFS region, Fe(III) appears to be located in the 5-coordinated...yellowish, from Nova Lima, Brasil], a Febearing enstatite [9.6(2) wt% FeO; >99% [6]Fe(II); from Bamble,... a yoderite [>99% [5]Fe(III); from Mautia Hill, Kongwa, Tanzania], an acmite (>99% [6]Fe(III); from Mont...because of their high Fe content (except Fe-bearing enstatite and LiAlO2). The optimum thickness of samples |  | | 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 |  | 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) | | Yellow sapphirine with a doubled b-axis occurs in enstatite-hornblende-sapphirine rocks at the contact between...dolomite marble and yoderitequartz-talc schist on Mautia Hill, Tanganyika. It has refractive indices a 1-725:j=...indicative of partial MgA1 ordering. The associated enstatite and hornblende have compositions . s+ [6] [4]...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 |  | | 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) | | 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 |  | | 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 |  | | 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) | | Pradesh Binny and Loya mines, Kondapalli, chromite, enstatite, 4o6 and M38 Ganginemi, Kondapalli, chromite,... bronzite, 4o6 and M38 Seshadripuram Hill, Kondapalli, pargasite, 28o and M31 Gujarat Amba Dongar, magnetite...magnetite, 463 Dhajala, Surendranagar District, meteorite, 493 Donabanda Hill, allanite, 28o and M3I Burma Mogok...5 I8 TOPOGRAPHICAL Indonesia Pomalea-Kolska district, Sulawesi, lateritic Ni ore, I43 and M4, 513 Japan...Kaduna, microcline, 443 Kenya Homa Mtn.; Kiahera Hill, Rusinga Island; Koru; and Rangwa, magnetite, carbonatite |  | 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) | | olivine edenite cummingtonite wüstite†periclase†enstatite (Mg0.9Fe0.1)2SiO4 NaCa2Mg5AlSi7O22(OH)2 (Mg,...Alm49Pyr39Spe1Gro11. References Pabst 1959 Alexander 1989‡ Hill 1984 Harrison et al. 1998 Stephenson and Moore 1969...yoderite (Mg,Al,Fe)8Si4(O,OH)20 6.1 5 C3v Mautia Hill, Kongwa, Tanzania Fleet et al. 1962 Higgins et al. 1982...compounds with low Fe concentrations (such as enstatite, grandidierite, etc.), XAFS spectra were collected...(7050–7300 eV), with 0.1 eV steps for the pre-edge region (7108–7116 eV). Some spectra presented here (as |  | | Journal (article/letter/editorial) | | ](~52 A former association of enstatite and kyanite By G. A. CHI~NER and T. R. SWEATMAN1 D e p a r t...Cambridge [Read 7 November 1968] Summary. An enstatite-cordierite-sillimanite--quartz rock from a pyroxenegranulite...high-pressure recrystallization to form the assemblage enstatite-kyanite-quartz, and a later, 'retrogressive' r~crystallization...those of the continental Moho. H E coexistence of enstatite and aluminium silicate is precluded at moderate...intermediate range of pressure and temperature, however, enstatite-sillimanite or e n s t a t i t e - k y a n i t |  | | Journal (article/letter/editorial) | | of Newlands: pyromorphite, 722 Derbyshire Calton Hill: olivine, ortho- and clinopyroxene, spinel, 483...auricha]cite, 441 Harp Edge: aurichalcite, 441 Masson Hill, Matlock: cinnabar, xc Nestus mine, Matlock Bath:...Wood: coffini~e, uraninite, xe Staffordshire Ecton Hill, Wetton: aurichaleite, celesfine, hydrozincite,...Good Hope mines, Ecton Hill, Wetton: aurichalcite, 441 Waterbank mine, Ecton Hill, Wettou: aurichalcite...Strachur: mullite, sillimanite, xci Ayrshire Byne Hill, Girvan: hydrogrossular, 814 Lugar sill: kaersutite |  | | Journal (article/letter/editorial) | | in the extended history of the Zambezi Belt this region was subject to tectonothermal regimes similar to...understanding the development of this complex tectonic region, as they lie at the triple junction between the...lithologically diverse section is centred around Kadunguri Hill (GR[ST 9619 3498]) (Fig. 3). STRUCTURAL SETTING...3. Detailed geological map of the Kadunguri Hill region. Circled stars indicate the localities of samples...with the type locality of this mineral (Mautia Hill, Tanzania; McKie, 1959) has been given by Johnson |  | | Journal (article/letter/editorial) | | kornerupine with boron-free minerals such as enstatite and sapphirine, fluids with relatively high XB2o3...(1965), having studied a kornerupine from Mautia Hill, Tanzania, with an exceptionally low Bvalue, showed...substitution line MgSi,~A1AI-follows part of the join enstatite-corundum Surprisingly, Schreyer and Seifert (1969)...peaks) Abbreviations: C=corundum, C/=chlorite, E-enstatite, Gr=grandidierite, Ko=kornerupine, Sa=sapphirine...lie on a line paralleling that which connects enstatite and corundum (Figs. 1 and 2). A simple theoretical |  | | Journal (article/letter/editorial) | | samplesexamined using NMR in this trum from Mautia Hill sapphirine (4.4wto/oFeO; McKie, study include...Val Codera, ltaly (no. 5, loc. cit.); 9 : Mautia Hill, Tanzania (no. 14, loc. cit.); 10 : Finero, ltaly...peak areas for these are added to represent one region of intensity in later discussion. The pressureof...Chatterjee,N.D., and Schreyer,W- (1972) The reaction enstatite""+ sillirnanite : sapphirine.. + quafiz in the...(1987) Peraluminoussapphirinefrom the Aileron district, Arunta block, central Australia. Mineralogical |  | | Journal (article/letter/editorial) | | minerals, 4th supplementary list of, I69 Broken Hill, New South Wales, ilvaite, rhodonite, hydrogrossular...twinning, post-growth readjustment of, 288 Cedar Hill, Pennsylvania, deweylite, 75 Celadonite, Bohemia...abnormal morphology from volcanic carbonatites in Tanzania, Kenya, Greenland, and India, 463 Deccan, India...talc-like mineral, 282 Dhajala, Surendranagar District, Gujarat, India, meteorite, 493 Diabantite, New...as inclusions in cordierite, anal., 48I Donabanda Hill, Kondapalli, Andhra Pradesh, India, allanite, 28o |  | | Journal (article/letter/editorial) | | p a t t e r n of t h e sapphirine from 1Viautia Hill (McKie, 1963) a n d of the non-space group absences...transformed by [101/0T0/0O~]. 24 S. Merlino: Hill sapphirine is a disordered member of the family...domains beside MDO 2 domains in sapphirine from Mautia Hill, prompted me to search for the existence in nature...sapphirine d- quartz assemblage, namely the reaction enstatite d- sillimanite ~ sapphirine ~- quartz; data in...formed "near the basis of the continental crust in a region of abnormally high temperature", with a subsequent |  | | Journal (article/letter/editorial) | | Benson Mine District, Adirondack Mountains, New York and the Manitouwadge Massive Sulfide District, Ontario...infrared analyses on a h6gbomite from Liganga, Tanzania, and found no water. Thus the inconsistency remains:...Ireland McKie (1963) Enstatite-tremolite-chlorite skarns, Mautia Hill Tanzania, Tanganyika Woodford...Titanomagnetite ore lenses in anorthosite, Liganga, Tanzania 5H z+ . 43+ 0 8 ,. where SR~+ =0.21q3.39, R2_2xTlxR...Coolen (1981) Calcsilicate granulite, Furua, Tanzania (600-700 ~ C, 5-7 Kb) Granulite-metamorphosed |  | | Journal (article/letter/editorial) | | Springer-Verlag 2001 Gilla Simon á Christian Chopin Enstatite±sapphirine crack-related assemblages in ultrahigh-pressure...inclusions consisting of various combinations of enstatite, gedrite, sapphirine, clinochlore, talc, magnesiostaurolite...origin, post-dating the highest-pressure stage. Enstatite (XMg ˆ 0.94±0.99) contains 0.7 to, typically,...alternative hydrous assemblages involving ®rst enstatite plus an Al-rich phase (kyanite, sapphirine, magnesiostaurolite)...discovery of polymineralic inclusions involving enstatite, gedrite, sapphirine, talc, corundum, spinel and |  | | Journal (article/letter/editorial) | | per unit cell]. From Dzhuzumli, Mt. Zirabulaksk region, Bukhara. Named after the alchemist Avieenna (Abu...phlogopite deposit of the Medviezhy river, Aldan region, Yakutia. Named from the composition. [M.A. 14-280...Anderson, G. F. Claringbull, R. J. Davis, and D. K. Hill, 1961. Nature, vol. 190, p. 997. (Th,U)(Ca,Fe,Pb)~SisO20;...tetragonal phase. From Eheliyagoda, Raknapura district, Ceylon. Named after the discoverer, Mr. F. L...p. 654. A variety of muscovite from the Iimori district, Japan, near K~(Mg,Fe)Fc'"A13SiTO20(OH)4. Ferri-phlogopite |
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