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Widmanstatten pattern

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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 of rutile and ilmenite needles and plates in garnet from the Brimfield Schist, CT (322A-1). (d and e) rutile and apatite lamellae (341B-5). Extended depth of field maintains focus throughout the depth of the thin sections in panels b through e (see Methods). (Color online.)

Precipitation structures in natural samples. ( a ) Widmanstätten pattern in... Available to Purchase

Published: 01 July 2019
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
Image
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 HNO3.

Widmanstätten pattern in one of the cross-sections of the Cheder meteorite ... Available to Purchase

Published: 01 June 2011
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 3 .
Image
X-ray maps of kamacite and taenite showing Widmanstätten pattern in Toluca iron meteorite. (a) Toluca iron meteorite on the Bruker D8 Discover diffractometer; etched portion of the cut surface shows the Widmanstätten pattern. (b) General area detector diffraction system (GADDS) image collected at single location on Toluca meteorite, showing polycrystalline Debye rings with a strong preferred orientation; reflection on left is from kamacite (110) (44.6° 2θ) and reflection on right is from taenite (111) (43.5° 2θ) (omega scan, 6 min, 500 μm beam). (c) Photograph of the sample area mapped in 2-D mineral maps. (d, e) 2-D kamacite and taenite maps, respectively, of area shown in (c). GADDS images collected at 0.5 mm intervals; intensities were measured by integration of reflections shown in (b). Scale: maximum intensity is 650 000 counts for kamacite, 325 000 counts for taenite. Orientational relationships are well represented compared with the photograph in (c). The reason for the absence of intensity in the lower left hand portion of the kamacite pattern is unclear, but may be an effect of crystal orientation, where X-rays from the horizontal kamacite laths were oriented outside the angular range of the detector.

X-ray maps of kamacite and taenite showing Widmanstätten pattern in Toluca ... Available to Purchase

Published: 28 September 2007
Fig. 8. X-ray maps of kamacite and taenite showing Widmanstätten pattern in Toluca iron meteorite. ( a ) Toluca iron meteorite on the Bruker D8 Discover diffractometer; etched portion of the cut surface shows the Widmanstätten pattern. ( b ) General area detector diffraction system (GADDS) image
Journal Article

Mineralogical socibty: London Available to Purchase

Published: 01 May 1940
American Mineralogist (1940) 25 (5): 378–379.
...% of the 1340 known falls represented in specimens over 5 gm. in weight. He discussed the relationship of the Ni content to the pattern of the siderites and told of the work being done to learn more of the cause of the Widmanstatten patterns. He also recounted some interesting observations made in connection...
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New York mineralogical club, inc. Available to Purchase

F. H. Pough
Published: 01 May 1940
American Mineralogist (1940) 25 (5): 377–378.
... has 53% of the 1340 known falls represented in specimens over 5 gm. in weight. He discussed the relationship of the Ni content to the pattern of the siderites and told of the work being done to learn more of the cause of the Widmanstatten patterns. He also recounted some interesting observations made...
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Journal Article

Crystallographic and textural evidence for precipitation of rutile, ilmenite, corundum, and apatite lamellae from garnet Available to Purchase

Duncan S. Keller, Jay J. Ague
Published: 01 July 2019
American Mineralogist (2019) 104 (7): 980–995.
DOI: https://doi.org/10.2138/am-2019-6849
...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...
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View PDF for article title, Crystallographic and textural evidence for precipitation of rutile, ilmenite, corundum, and apatite lamellae from garnet
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Micro X-ray diffraction (μXRD): a versatile technique for characterization of Earth and planetary materials Available to Purchase

Roberta L. Flemming
Published: 28 September 2007
Canadian Journal of Earth Sciences (2007) 44 (9): 1333–1346.
DOI: https://doi.org/10.1139/e07-020
...Fig. 8. X-ray maps of kamacite and taenite showing Widmanstätten pattern in Toluca iron meteorite. ( a ) Toluca iron meteorite on the Bruker D8 Discover diffractometer; etched portion of the cut surface shows the Widmanstätten pattern. ( b ) General area detector diffraction system (GADDS) image...
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The Staunton iron meteorite (USNM 590), ~20 cm in length. This polished and etched slice displays the distinctive Widmanstatten pattern characteristic of many iron meteorites, with plates of low-Ni kamacite (Fe,Ni metal) exsolved from high-Ni taenite at cooling rates of 1–100 °C/Myr. Iron meteorites sample the cores of differentiated asteroids, provide some of our best clues to the chemical nature of our own core, and continue to fall to Earth. Photo courtesy of T. McCoy.

The Staunton iron meteorite (USNM 590), ~20 cm in length. This polished and... Available to Purchase

Published: 01 November 2008
F igure 4. The Staunton iron meteorite (USNM 590), ~20 cm in length. This polished and etched slice displays the distinctive Widmanstatten pattern characteristic of many iron meteorites, with plates of low-Ni kamacite (Fe,Ni metal) exsolved from high-Ni taenite at cooling rates of 1–100 °C/Myr
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Non-chondritic meteorites. (a) A polished and etched slab (1151 g; 10 cm maximum diameter) from the Staunton iron meteorite with taenite exsolved from kamacite in a Widmanstätten pattern. (b) A polished slab of the Esquel pallasite (1091 g; 8 cm maximum diameter), a stony-iron meteorite, with kamacite (silver in reflected light) and forsteritic olivine (yellow in transmitted light). (c) The Cumberland Falls aubrite (1227 g; 11 cm maximum dimension), an achondrite meteorite observed to fall in Kentucky in 1919. This polymict breccia contains a rich variety of silicate-rich clasts of different lithologies derived primarily from ordinary chondrites. (Photos courtesy of the National Museum of Natural History, Smithsonian Institution.) (Color online.)

Non-chondritic meteorites. ( a ) A polished and etched slab (1151 g; 10 cm ... Available to Purchase

Published: 01 May 2021
Figure 1. Non-chondritic meteorites. ( a ) A polished and etched slab (1151 g; 10 cm maximum diameter) from the Staunton iron meteorite with taenite exsolved from kamacite in a Widmanstätten pattern. ( b ) A polished slab of the Esquel pallasite (1091 g; 8 cm maximum diameter), a stony-iron
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Images of the interior surface of various meteorites. (A) The Allende CV3 carbonaceous chondrite, a primitive carbonaceous meteorite containing organic material, chondrules (melted droplets of preexisting minerals—round objects in the image); carbonaceous chondrites have been linked to various dark-asteroid classes. (B) The Seymchan pallasite, a differentiated meteorite or impact melt containing large grains of olivine in a metallic matrix; pallasites have been linked to A-class asteroids. (C) The Odessa differentiated iron meteorite showing the Widmanstätten pattern indicative of slow cooling; iron meteorites have been linked to M-class asteroids. (D) The Norton County aubrite, a high-temperature, highly reduced, differentiated meteorite; aubrites have been linked to E-class asteroids. (E) The NWA 869 L4-L6 ordinary chondrite breccia; darker regions are fragments of a carbonaceous chondrite, likely added as a result of an impact. Scale bars are in millimeters.

Images of the interior surface of various meteorites. ( A ) The Allende CV3... Available to Purchase

Published: 01 February 2014
to various dark-asteroid classes. ( B ) The Seymchan pallasite, a differentiated meteorite or impact melt containing large grains of olivine in a metallic matrix; pallasites have been linked to A-class asteroids. ( C ) The Odessa differentiated iron meteorite showing the Widmanstätten pattern indicative
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Images of the interior surface of various meteorites. (A) The Allende CV3 carbonaceous chondrite, a primitive carbonaceous meteorite containing organic material, chondrules (melted droplets of preexisting minerals—round objects in the image); carbonaceous chondrites have been linked to various dark-asteroid classes. (B) The Seymchan pallasite, a differentiated meteorite or impact melt containing large grains of olivine in a metallic matrix; pallasites have been linked to A-class asteroids. (C) The Odessa differentiated iron meteorite showing the Widmanstätten pattern indicative of slow cooling; iron meteorites have been linked to M-class asteroids. (D) The Norton County aubrite, a high-temperature, highly reduced, differentiated meteorite; aubrites have been linked to E-class asteroids. (E) The NWA 869 L4-L6 ordinary chondrite breccia; darker regions are fragments of a carbonaceous chondrite, likely added as a result of an impact. Scale bars are in millimeters.

Images of the interior surface of various meteorites. ( A ) The Allende CV3... Available to Purchase

Published: 01 February 2014
to various dark-asteroid classes. ( B ) The Seymchan pallasite, a differentiated meteorite or impact melt containing large grains of olivine in a metallic matrix; pallasites have been linked to A-class asteroids. ( C ) The Odessa differentiated iron meteorite showing the Widmanstätten pattern indicative
Image
Images of the interior surface of various meteorites. (A) The Allende CV3 carbonaceous chondrite, a primitive carbonaceous meteorite containing organic material, chondrules (melted droplets of preexisting minerals—round objects in the image); carbonaceous chondrites have been linked to various dark-asteroid classes. (B) The Seymchan pallasite, a differentiated meteorite or impact melt containing large grains of olivine in a metallic matrix; pallasites have been linked to A-class asteroids. (C) The Odessa differentiated iron meteorite showing the Widmanstätten pattern indicative of slow cooling; iron meteorites have been linked to M-class asteroids. (D) The Norton County aubrite, a high-temperature, highly reduced, differentiated meteorite; aubrites have been linked to E-class asteroids. (E) The NWA 869 L4-L6 ordinary chondrite breccia; darker regions are fragments of a carbonaceous chondrite, likely added as a result of an impact. Scale bars are in millimeters.

Images of the interior surface of various meteorites. ( A ) The Allende CV3... Available to Purchase

Published: 01 February 2014
to various dark-asteroid classes. ( B ) The Seymchan pallasite, a differentiated meteorite or impact melt containing large grains of olivine in a metallic matrix; pallasites have been linked to A-class asteroids. ( C ) The Odessa differentiated iron meteorite showing the Widmanstätten pattern indicative
Image
Images of the interior surface of various meteorites. (A) The Allende CV3 carbonaceous chondrite, a primitive carbonaceous meteorite containing organic material, chondrules (melted droplets of preexisting minerals—round objects in the image); carbonaceous chondrites have been linked to various dark-asteroid classes. (B) The Seymchan pallasite, a differentiated meteorite or impact melt containing large grains of olivine in a metallic matrix; pallasites have been linked to A-class asteroids. (C) The Odessa differentiated iron meteorite showing the Widmanstätten pattern indicative of slow cooling; iron meteorites have been linked to M-class asteroids. (D) The Norton County aubrite, a high-temperature, highly reduced, differentiated meteorite; aubrites have been linked to E-class asteroids. (E) The NWA 869 L4-L6 ordinary chondrite breccia; darker regions are fragments of a carbonaceous chondrite, likely added as a result of an impact. Scale bars are in millimeters.

Images of the interior surface of various meteorites. ( A ) The Allende CV3... Available to Purchase

Published: 01 February 2014
to various dark-asteroid classes. ( B ) The Seymchan pallasite, a differentiated meteorite or impact melt containing large grains of olivine in a metallic matrix; pallasites have been linked to A-class asteroids. ( C ) The Odessa differentiated iron meteorite showing the Widmanstätten pattern indicative
Image
Images of the interior surface of various meteorites. (A) The Allende CV3 carbonaceous chondrite, a primitive carbonaceous meteorite containing organic material, chondrules (melted droplets of preexisting minerals—round objects in the image); carbonaceous chondrites have been linked to various dark-asteroid classes. (B) The Seymchan pallasite, a differentiated meteorite or impact melt containing large grains of olivine in a metallic matrix; pallasites have been linked to A-class asteroids. (C) The Odessa differentiated iron meteorite showing the Widmanstätten pattern indicative of slow cooling; iron meteorites have been linked to M-class asteroids. (D) The Norton County aubrite, a high-temperature, highly reduced, differentiated meteorite; aubrites have been linked to E-class asteroids. (E) The NWA 869 L4-L6 ordinary chondrite breccia; darker regions are fragments of a carbonaceous chondrite, likely added as a result of an impact. Scale bars are in millimeters.

Images of the interior surface of various meteorites. ( A ) The Allende CV3... Available to Purchase

Published: 01 February 2014
to various dark-asteroid classes. ( B ) The Seymchan pallasite, a differentiated meteorite or impact melt containing large grains of olivine in a metallic matrix; pallasites have been linked to A-class asteroids. ( C ) The Odessa differentiated iron meteorite showing the Widmanstätten pattern indicative
Image
The Widmanstätten figure or pattern of this iron meteorite is due to the differential etching of kamacite (α-iron with about 5.5 % nickel) and taenite (γ-iron with between 13 % and 48 % nickel). The kamacite is in the form of plates that have exsolved, parallel to the faces of the octahedron, from taenite. The width of the kamacite lamellae is a measure of cooling rate (photo credit: A. Pack).

The Widmanstätten figure or pattern of this iron meteorite is due to the di... Available to Purchase

Published: 01 April 2018
Figure 10.8 The Widmanstätten figure or pattern of this iron meteorite is due to the differential etching of kamacite (α-iron with about 5.5 % nickel) and taenite (γ-iron with between 13 % and 48 % nickel). The kamacite is in the form of plates that have exsolved, parallel to the faces
Journal Article

Evidence of Shock Pressure above 600 kilobar and Post-shock Annealing in Nyaung IIIAB Octahedrite Available to Purchase

D. Ray, S. Ghosh, S.V.S. Murty
Published: 01 February 2015
Jour. Geol. Soc. India (2015) 85 (2): 153–162.
DOI: https://doi.org/10.1007/s12594-015-0203-x
..., Nyaung closely matches with Picacho octahedrite with 7.08 wt% Ni and 0.06 wt% P ( Yang and Goldstein, 2006 ). Importance of relationship between Widmanstätten pattern and the metallographic cooling rate in octahedrites was first proposed by Wood (1964) . According to him two factors- “bulk Ni...
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Carletonmooreite, Ni 3 Si, a new silicide from the Norton County aubrite meteorite Available to Purchase

Laurence A.J. Garvie, Chi Ma, Soumya Ray, Kenneth Domanik, Axel Wittmann, Meenakshi Wadhwa
Published: 01 November 2021
American Mineralogist (2021) 106 (11): 1828–1834.
DOI: https://doi.org/10.2138/am-2021-7645
... they host perryite, an Fe-Ni silicide phosphide ( Wai 1970 ; Wasson and Wai 1970 ; Okada et al. 1991 ). Other minerals in the metal nodules include schreibersite, daubréelite, caswellsilverite, and graphite ( Garvie et al. 2018 ). Unlike many meteoritic metals, a typical Widmanstätten pattern of kamacite...
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View PDF for article title, Carletonmooreite, Ni 3 Si, a new silicide from the Norton County aubrite meteorite
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Differentiated and planetary meteorites. a) Eucrite NWA 11245, consisting predominantly of white grains of plagioclase feldspar and grey grains of pyroxene. 5 cm across. b) Eucrite NWA 1109. Plane-polarised transmitted light, field of view is 5 mm. NWA 1109 is brecciated, and is composed of comminuted (broken) fragments of individual mineral grains of plagioclase and pyroxene, as well as rock fragments (clasts). The larger coarse-grained rock clast on the right of the image consists predominantly of plagioclase feldspar (white) and pyroxene (brown) c) Angrite, Sahara (SAH) 99555. Plane-polarised transmitted light, field of view is 4 mm. Elongate white grains are feldspar, and pink / brown grains are pyroxene. d) Polished and etched surface of the iron meteorite, Gibeon, showing the Widmanstätten pattern and rounded inclusions of iron sulfide. Photo courtesy of Institute of Meteoritics, University of New Mexico. e) Lunar gabbro, NWA 8127. Cross-polarised light, field of view 1.25 mm. Igneous texture includes pyroxene (colored grains with colored lineations showing exsolution), olivine (rounded, colored grains), oxides (black, angular) and maskelynite (shock-transformed plagioclase feldspar: black / grey). Fracturing in olivine and pyroxene results from shock. f) Martian meteorite, Tissint, an olivine-phyric shergottite (basalt). Plane polarised light, field of view 2.5 mm. Large grains of olivine are surrounded by a fine-grained groundmass consisting of pyroxene (grey), maskelynite (white) and oxides (black / opaque). Olivine and pyroxene are highly fractured from shock. The olivine grain in the upper right has two circular melt inclusions. The linear black feature in the upper left is an impact-melt vein.

Differentiated and planetary meteorites. a) Eucrite NWA 11245, consisting... Available to Purchase

Published: 01 July 2024
. Plane-polarised transmitted light, field of view is 4 mm. Elongate white grains are feldspar, and pink / brown grains are pyroxene. d) Polished and etched surface of the iron meteorite, Gibeon, showing the Widmanstätten pattern and rounded inclusions of iron sulfide. Photo courtesy of Institute
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Springwater pallasite (a stony-iron meteorite) showcasing gem-quality olivine in iron-nickel metal with hints of the Widmanstätten exsolution pattern.

Springwater pallasite (a stony-iron meteorite) showcasing gem-quality olivi... Available to Purchase

Published: 01 June 2023
Springwater pallasite (a stony-iron meteorite) showcasing gem-quality olivine in iron-nickel metal with hints of the Widmanstätten exsolution pattern.
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Olivine from across the globe and beyond. (A) Gem cut in a colorless forsterite crystal from Mogok, Myanmar. Sample and photo: Jon Mehdi. (B) Clear brown crystal of fayalite from Caspar quarry, Ettringen, Germany. Sample: Willi Schüller; photo: Stephan Wolfsried. (C) Gem G3398 cut in an olive-green, hydrothermal crystal at Fo90–92 from Zabargad Island (Clocchiatti et al. 1981). This is the largest cut reported in the world, with a weight of 311.8 carats (62.35 g). Sample: Smithsonian Institution, NMNH, Russel Feather; Photo: Ken Larsen. (D) Mantle xenolith from San Carlos Apache Reservation (AZ, USA) made of anhedral olivine grains at Fo87–92 and enclosed in a hawaiitic matrix. Sample: Kyle Dayton; Photo: Benoît Welsch. (E) Olivine-rich basalt (“oceanite” as defined by A.F.A Lacroix) from the April 2007 Piton de la Fournaise eruption (Reunion Island) containing large amounts of Fo83–85 olivine macrocrysts (Welsch et al. 2013); crossed polar microphotograph of a 30-µm thin section. Sample: OVPF/LGSR; Photo: Benoît Welsch. (F) Long dark blades outlining plate spinifex (A3), Fo89 olivine now ghosted by serpentine in Alexo komatiite, Ontario (2.7 Ga). Sample and photo: François Faure. (G) Sand made of olivine (green), basalt (black), shell and coral (white, brown) fragments from Green Sand Beach (Big Island, Hawaii, USA). Sample and photo: Benoît Welsch. (H) Barred olivine (BO) chondrule in meteorite NWA 2180 (carbonaceous chondrite type CV3) with a composition in the range of Fo91–99 (crossed polar microphotograph of a 30-µm thin section with a lambda plate). Sample: Museo di Scienze Planetarie della Provincia di Prato – Parsec, Italy; photo: Bernardo Cesare. (I) Polished, etched section of “Tibet” pallasite Gyarub Zangbo containing Fo77–78 olivine crystals set in an iron–nickel matrix (kamacite and taenite displaying a Widmanstätten pattern). Sample and photo: Steve Juvertson.

Olivine from across the globe and beyond. ( A ) Gem cut in a colorless fors... Available to Purchase

Published: 01 June 2023
, etched section of “Tibet” pallasite Gyarub Zangbo containing Fo 77–78 olivine crystals set in an iron–nickel matrix (kamacite and taenite displaying a Widmanstätten pattern). S ample and photo : S teve J uvertson .