 | | Journal (article/letter/editorial) |
| DECEMBER 1 9 7 7 , VOL. 4 I , PP. 487-92 The Mayo Belwa meteorite: a new enstatite achondrite fall A. L. GRAHAM...(Natural History), London SW7 5BD SUMMARY.Mayo Belwa, a highly shocked enstatite achondrite, fell during...the evening of 3 August I974 in the Adamawa District, NE. Nigeria (8~ 58' N., 12~ o5' E.). The stone weighed...and was deposited in the Geological Survey of Nigeria and loaned for study to the British Museum (Natural...I-2 % Si and the troilite contains lq ~ Ti. The meteorite possesses vuggy cavities, which contain fluor-amphibole |
 | | Journal (article/letter/editorial) |
| METAL AND SCHREIBERSITE IN MAYO BELWA, AN ENSTATITE ACHONDRITE A.L. Graham Department ofMineralogy British...Museum (Natural History) London SW7 5BD The Mayo Belwa meteorite (an aubrite} contains discrete metal grains...are distributed heterogeneously throughout the meteorite and are present both in the fine-grained matrix... The Mayo Belwa meteorite is a brecciated enstatite achondrite (aubrite) which fell in Nigeria in August...and form the subject of the present paper. The meteorite is composed mainly of disordered enstatite, WOo |
 | | Journal (article/letter/editorial) |
| of a metallic nodule from the Bondoc Peninsula meteorite, I21 (Syn.), MI Bad na h'Achlaise, Assynt, Sutherland...), and FRANCIS (J. G.), Amphibole in the Mayo Belwa meteorite, 53I BEVAN (J. C.), see BEVAN (A. W. R.)...anal., opt., cryst., Xray, 398 Bondoc Peninsula meteorite, metallic nodule with silicate inclusions, anal...), M l Boracite, see Iron-boracite Boulby mine, Loftus, Saltburn, Yorkshire, iron-boracite, 404 BOWLES...blast-furnace slag and a comparison with the Allende meteorite, 493 Callowhill Upper, Newtown Mr. Kennedy, Co |
 | | Journal (article/letter/editorial) |
| EARTII ELEMENT ABUNDANCES IN SEPARATED PHASES OF MAYO BELWA, AN ENSTATITE ACHONDRITE A.L. Grabam and P. Henderson... SW7 SBD. U.K. Separated fractions from the Mayo Belwa aubrite have been analysedfor the rare earth...account for the total REE abundances in the bulk meteorite which are about 0.5 times chondritic. The REE...ofthe feldspar is greater than that ofthe bulk meteorite. The partition coefficients for the REE between...aubrites - are heterogeneous assemblages of nearly iron-free enstatite and generally less than 15%of other |
 | | Journal (article/letter/editorial) |
| x Impact melting in the Cumberland Falls and Mayo Belwa aubrites Alan E. RUBIN* Institute of Geophysics...when it collided with the Cumberland Falls host. Mayo Belwa is the first known aubrite impact melt breccia...constitute 5 vol% of the meteorite. They occur nearly exclusively within the Mayo Belwa matrix; literature...impact melt breccias. It seems likely that in Mayo Belwa, volatiles were vaporized during an impact event...material in two aubrites—Cumberland Falls and Mayo Belwa. Cumberland Falls is a polymict breccia with |
 | | Report (issue) |
| 8:00 O 22 [(OH)0: 81 F 0:57 ] §=1:38 : (2) Mayo Belwa meteorite; by electron microprobe, average of three...southwest of Olekminsk, Yakutia, Russia. In the USA, at Iron Hill, Gunnison Co., Colorado and the Leucite Hills...and J.G. Francis (1977) Amphibole in the Mayo Belwa meteorite: ¯rst occurrence in an enstatite achondrite |
 | | Journal (article/letter/editorial) |
| the remaining aubrites (Bustee, Khor Temiki, Mayo Belwa and Shallowater). High Ga/Ni and Ge/Ni ratios...have a wide compositional range like that in Mayo Belwa (Graham, 1978). In Shallowater the distribution...(Keil, 1968), this is not so for the aubrite Mayo Belwa (Graham, 1978) and therefore it was decided to...usually "closely associated with metallic nickel-iron" (Keil, 1968). However, P is present in kamacite...Aubrites Aubres Bishopville Bustee KhorTemiki Mayo Belwa Norton County Peiia Blanca Spring Shallowater |
 | | Journal (article/letter/editorial) |
| the press. FALL OF THE ACAPULCO, MEXICO,STONY METEORITE Name: ACAPULCO Place of fall: El Quemado Colony... Source: DISCOVERY OF THEALISKEROVO, USSR,IRON METEORITE Name: ALISKEROVO Place of find: About 4...Total weight: 58.4 kg Circumstances of find: Meteorite was found by the worker A. Cherednichenko when... USSR. FALL OF THE ALTA 'AMEEM, IRAQ, STONY METEORITE Name: ALTA'AMEEM Place of fall: About 100 m...reported hearing a humming sound that ended when the meteorite struck the ground. Source: Dr. Y. Al-Rawi, Department |
 | BURBINE, Thomas H., McCOY, Timothy J., NITTLER, Larry R., BENEDIX, Gretchen K., CLOUTIS, Edward A., Dickinson, Tamara L. (2002) Spectra of extremely reduced assemblages: Implications for Mercury. Meteoritics & Planetary Science, 37 (9) 1233-1244 doi:10.1111/j.1945-5100.2002.tb00892.x | Journal (article/letter/editorial) |
| believed to require reduction ofFeO to nanophase iron, thus requiring a few percent FeO in the material...observations suggest heterogeneity across the surface with iron-depleted basaltic, mafic, and ultramafic regions...large core that formed out of reduced (Fee) metallic iron that sank to the center ofthe planet during differentiation...and Britt, 1998), implying a much higher metallic iron content. One possibility for solving this density...form Mercury out of material enriched in metallic iron relative to enstatite chondrites. Another possibility |
 | | Journal (article/letter/editorial) |
| order to make them available for other workers. IRON METEORITES An analytical scheme was developed for...Spectrophotometric analysis (A.A.S.). Partial analyses of 30 iron meteorites are given in Table 1. STONY METEORITES...methods (Jeffrey and Wilson, 1960) and secondly iron as Fe 3+ was extracted into di-isopropyl ether from... Table 1 Iron meteorites Ni % Iron meteorites Co % P % Tombigbee River Babb's Mill (Troost's iron) Ballinoo...52 0.47 0.74 0.03 Chinautla Coolac Gladstone (iron) Henbury Huizopa B.M. 1913,434 B.M. 1966,52 B.M |
 | | Journal (article/letter/editorial) |
| the aubrites. Literature data even for the same meteorite often disagree. Whole-rock REE analyses by STRAIT...studies involving several samples from the same meteorite ( OKADA et al., 1988; KEIL et al., 1989). NEWSOM...In an investigation of mineral separates from Mayo Belwa, GRAHAM and HENDERSON ( 1985) reported a “magnetic”...achondrites, or aubrites. Both are dominated by nearly iron-free enstatite (REID and COHEN, 1967) with varying...chondrites are further divided into EH (high-iron) and EL (low-iron) groups ( SEARS et al., 1982; KALLEMEYNand |
 | | Journal (article/letter/editorial) |
| enstatlte from Btshopvllle, Cumberland Falls and Mayo Belwa have also been analysed In these three aubrItes...of our results uncertain Cumberland Falls and Mayo Belwa probably suffered relatwely recent shocks and...analysed density separates from the type-I Indarch meteorite and found an lsochron indistinguishable from their...the aubntes Blshopvdle, Cumberland Falls and Mayo Belwa, all three of which might have had a shock-dommated...Blshopvllle (1 25 g), Cumberland Falls (1 25 g) and Mayo Belwa (800 mg) were obtained from the Museum National |
 | | Journal (article/letter/editorial) |
| patterns extends to d&rent samples from the same meteorite. STRAIT ( 1983) found positive Eu anomalies for...studies involving several samples from the same meteorite ( OKADA et al., 1988; KEIL et al., 1989). An investigation...straightforward results. Analyses of mineral separates from Mayo Belwa (GRAHAM and HENDERSON,1985) showed that a “magnetic”...known) of stony meteorites. They consist of nearly iron-free. enstatite (REID and COHEN, 1967), with minor...on the Bishopville enstatite achondrite. This meteorite is a typical aubrite except for a high modal abundance |
 | | Journal (article/letter/editorial) |
| alert to the potential discovery of a genuine meteorite from Mercury which, superficially, should resemble...and, if true, a meteorite from Mercury should not resemble any currently known meteorite type. & 2010 Elsevier...1940; Keil et al., 1989), LAP 02233 (Antarctic Meteorite Newsletter, 2003, 2004), LAP 03719 (McCoy et al...classified as aubrites that are actually other meteorite types. Table 1 Ranges and average modal (vol%)...Bishopville, Bustee, Cumberland Falls, Khor Temiki, Mayo Belwa, Norton County, Peña Blanca Spring and Pesyanoe |
 | | Journal (article/letter/editorial) |
| weathering category A (Meteorite Newsletter 15), Y-980223 is listed as category A/B (Meteorite Newsletter 16)...cardboard slides. For standards we used the Allende meteorite (Jarosewich et al., 1987), the USGS international...1994), and the North Chile (Filomena) IIAB iron meteorite. Analyses were carried out following a protocol...difficult to use these data to determine whether this meteorite is more closely related to EH or EL chondrites...with increasing volatility. In contrast, the meteorite exhibits a much more complex fractionation pattern |
 | | Journal (article/letter/editorial) |
| chondrite impact-melt breccia (Rubin 2010). The Mayo Belwa whole rock is itself an impact-melt breccia containing...Olympus BX60 petrographic microscope. Antarctic meteorite sections are from Johnson Space Center, NASA;...brecciation characteristics of selected aubrites. Meteorite Shock Shock stage stage Recovery pyroxene olivine...exhibiting many of the shock features evident in other meteorite groups because the majority of the features involve...and developed a regolith. By analogy to other meteorite groups (e.g., ordinary chondrites, CK chondrites |
 | | Journal (article/letter/editorial) |
| Pefia Blanca Spring (Lonsdale, 1947); 4 em in Mayo Belwa (Graham et al., 1977); 8 em in Norton County...BHVO-I (Gladney et al., 1983) and the Allende meteorite reference sample (larosewich et al., 1987) (used...Norton County aubrite is composed largely of nearly iron-free enstatite and has a pronounced brecciated texture...chondrite Kota-Kota (Reed, 1968) and the anomalous iron meteorite Horse Creek (Fredriksson and Henderson, 1965)...chondrite and the Mount Egerton anomalous stony-iron are higher in Fe (6.3 and 9.4%, respectively; Reed |
 | Floss, C., Jolliff, B. L., Benedix, G. K., Stadermann, F. J., Reid, J. (2007) Hammadah al Hamra 193: The first amphibole-bearing winonaite. American Mineralogist, 92 (4) 460-467 doi:10.2138/am.2007.2253 | Journal (article/letter/editorial) |
| fluor-apatite in this meteorite. The presence of fluoro-edenite in HaH 193, a meteorite that experienced extensive...(~17 known members) of reduced meteorites (i.e., iron is present as either Fe0 or Fe2+). Their oxygen...from those of other meteorite groups, except for silicate inclusions in IAB iron meteorites (Clayton...of the winonaites and silicate inclusions in IAB iron meteorites, and concluded that these meteorites...2003), attesting to the chondritic origin of this meteorite group. Hammadah al Hamra (HaH) 193 was found in |
 | | Journal (article/letter/editorial) |
| which could have only been preserved if this meteorite was not subjected to any significant thermal metamorphism...have only been identified in clasts in one other meteorite, the LL3.1 ordinary chondrite Krymka (e.g., Semenenko...analysis by the Johnson Space Center Antarctic Meteorite Collection. QUE 99177 was classified as Antarctic...clast is coarser-grained than matrix in the host meteorite. It contains olivine, amphiboles, sulfides, and...olivines are different from those in the host meteorite. Olivines are at least one order of magnitude |
 | | Journal (article/letter/editorial) |
| Aubrites Shock effects Asteroidal parent bodies Meteorite breccias Impact melting Sinoite a b s t r a c...impact-melt globules and spherules. No single meteorite possesses all of these features, although many...history (4.50–4.54 Ga ago); only one enstatite-rich meteorite (EH4 Bethune) appears to have been impact heated...Table 2 Shock stages of enstatite chondrites. Meteorite Group/type Recovery Shock stage Breccia type...Erde xxx (2014) xxx–xxx 6 Table 2 (Continued) Meteorite Group/type Recovery Shock stage Breccia type |
 | | Journal (article/letter/editorial) |
| Aubrites represent samples from a third enstatite meteorite parent body. 3. The aubrite parent body may have...Shallowater may be a sample from yet a fourth enstatite meteorite parent body. 6. Shallowater experienced a complex...reassembly. 7. It is unknown why some enstatite meteorite parent bodies melted (the aubrite and Shallowater...Tucson iron meteorite which had previously been thought to be related to the enstatite meteorite clan (Nehru...Kaczaral et al. (1988) suggested that all three meteorite types come from one parent body that was initially |
 | | Journal (article/letter/editorial) |
| in this study were selected from the Antarctic meteorite collection of the National Institute of Polar...first discovery of phlogopite in an enstatite meteorite. Figure 3 shows a typical occurrence of the phlogopite...occurrence, since phases A/B are absent in this meteorite (b). Width of image is 110 pm for (a) and 190pm...in the opaque phases was not observed in this meteorite. Plagioclase (up to 20-30 pm) and a silica mineral...minerals, but no niningerite was found in this meteorite. Instead, there is a grain of (Mg, Mn, Fe)S solid |
 | | Journal (article/letter/editorial) |
| Society, 1997. Printed in USA. Mineralogy of meteorite groups ALANE. RUBIN Institute of Geophysics and...carbonates. In addition to kamacite and taenite, iron meteorites contain carbides, elemental C, nitrides...sulfides. Silicate inclusions in IAB/IIICD and IIE iron meteorites consist of mafic silicates, plagioclase...shocked ordinary chondrites. Secondary minerals in meteorite finds that formed during terrestrial weathering...identified 16 minerals including "pure iron" (kamacite), nickel-iron (taenite), graphite, schreibersite, |
 | | Catalog/List |
| PYRITE Huanzala Mine, Huallanca District, Dos de Mayo Province, Huánuco Department, Peru For hundreds...profusion of small side faces. With an exceedingly thin iron oxide coating that gives rise to a charming amount...of the Huebnerite seen is a mixture of Ferberite (Iron Tungstate) and Huebnerite (Manganese Tungstate)...percentage of Huebnerites containing little or no iron. Besides the exceptional color already noted, this...RED MATCHED PAIR — 17.26 TCW Ofiki, Oyo State, Nigeria Rubellite is a particularly beautiful gemstone |
 | | Journal (article/letter/editorial) |
| 1996, 1998). Graphite is a rare mineral in some iron meteorites (Mason, 1963), ureilites, enstatite chondrites...individual sample N 1290/29 (catalogue number of the meteorite collection of the Museum of Natural History, NAS...shocked more intensively than the rest of the meteorite and contains regions of completely shock-melted...shocked more intensively than the rest of the meteorite (Semenenko and Perron, 1995, 1996) the studied...enstatite chondrites, enstatite achondrites and iron meteorites (Bevan et al., 1977). The presence of |
