...D. Ray; S. Ghosh; S.V.S. Murty Abstract Nyaung iron is structurally a medium octahedrite (IIIAB) with several large inclusions of troilite-daubreelite aggregates and rare small inclusions of rhabdites. Primary cooling related textures include Widmanstätten structures on mesoscopic scale and large...

... and the origin of enstatite chondrites and achondrites . Geochimica et Cosmochimica Acta , 34 , 169 – 184 . Yang , J. , and Goldstein , J.I. ( 2005 ) The formation of the Widmanstätten structure in meteorites . Meteoritics & Planetary Science , 40 , 239 – 253 . Yang , C.-W...

... or highly controversial), characteristics of the important rock-forming minerals that comprise meteorites, recipes for etching iron meteorites to reveal the Widmanstatten structure and for chemically testing suspected meteorites for nickel, a listing of prominent museum collections and research facilities...

... or exchanges. Analyses of them, however, led to a state of great confusion. In Berlin, Rose examined the two Santa Rosa fragments he had obtained through Humboldt and a small (80 g) thin section of Rasgatá obtained from the Vienna Royal Imperial Museum. Rose could not observe a Widmanstätten structure...

... nanoparticles (~100 nm). These observations are consistent with growth in a molten system from a precursor Pb-Bi melt containing Au, Ag, and Cu. Minerals in the galena-matildite series typically display Widmanstätten textures (i.e., octahedral-like or basket-weave matildite ss lamellae in the galena ss matrix...

... des contraintes et des clinopyroxènes qui ont subi des chocs. (Shergottite NWA 3171). La cartographie minérale a été démontrée en reproduisant les textures d’exsolutions de kamacite à partir de taenite (structure de Widmanstätten) dans le météorite métallique de Toluca. Les données de diffraction...

... and section along profile 1–1; D , bar structure and section along profile 2–2 (SEM, 60×, reflected light). Fig. 2. Widmanstätten pattern in one of the cross-sections of the Cheder meteorite (magnification 10×). Neumann lines are observed on the right. Etching was done with the vapor of diluted HNO...

...Figure 1. Precipitation structures in natural samples. ( a ) Widmanstätten pattern in the Gibeon meteorite (photo courtesy of Christie's). ( b ) Thin section photomicrograph of rutile oriented along <111> garnet from the Brimfield Schist, CT (341B-5). ( c ) Thin section photomicrograph...

...K. L. Chakraborty; Jishu Roy; Tapan Majumder Abstract Various types of exsolution and replacement structures and textures uf the vanadium-bearing titano-magnetite ores have been described from the titano-magnetite deposits occurring in the gabbro-anorthosite complexes of Orissa, India. Attempt has...

...Fig. 2. Widmanstätten structure of kamacite (Kam) and taenite (Taen) segregations in the sample Mas-4. Scale bar 100 μm. ...

...Figure 3. Internal structure of a Whitecourt meteorite sample showing Widmanstätten texture (right) and area that has undergone recrystallization (left). Photograph by A. Locock. ...

...; Joseph I. Goldstein and Robert E. Ogilvie (1965) provided iron meteorite cooling rates and discussed the formation of the Widmanstätten pattern; Goldstein and coworkers continued this work into the present; Buchwald (1975) produced his massive handbook of iron meteorite structures and their histories...

... of the Widmanstätten pattern and the fragmentation of the schreibersite. The Havana beads are chemically grouped with three North American iron meteorites: Anoka (Minnesota); Edmonton (Kentucky); and Carlton (Texas). Among these, Anoka was found as multiple masses on opposite sides of the Mississippi River...

..., respectively). As well, the INAA standard for Ir and Ge was less than ideal in that Odessa, an octahedrite, is inhomogeneous on a fine scale owing to the Widmanstätten structure. However, the ratios of Ir and Au obtained by INAA over those obtained by ICP–MS analysis are very similar (1.8 and 2.2, respectively...

... , 30 – 41 . Yang , J. , and Goldstein , J.I. ( 2005 ) The formation of the Widmanstätten structure in iron meteorites . Meteorites & Planetary Science , 40 , 239 – 253 . Yang , J. , and Goldstein , J.I. ( 2006 ) Metallographic cooling rates of the IIIAB iron...

.... old impact crater 45 m in diameter, with a pristine ejecta ray structure. Such well-preserved structures have been previously observed only on extraterrestrial rocky or icy planetary bodies. This crater feature, and the association with an iron meteorite impactor and shock metamorphism, provides...

..., cracks and cleavages. Martitisation observed is evidently a result of weathering (Fig.Ic) and often the mineral is mostly attered leaving out Widmanstatten texture in hematitelmartite. Magnetite often shows pseudomorphic reptacement by goethite as well. Rarely small sulfide (pyrite) inclusions...