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| Northwest Africa 13639 | |||||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 13639 This is an OFFICIAL meteorite name. Abbreviation: NWA 13639 Observed fall: No Year found: 2020 Country: Morocco Mass:  361 g | ||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 279 approved meteorites classified as Mesosiderite. [show all] Search for other: Mesosiderites, Metal-rich meteorites | ||||||||||||||||||||||||||||||||
| Comments: | Approved 21 Feb 2021 | ||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 110:
Northwest Africa 13639 (NWA 13639) Morocco Purchased: 2020 Classification: Mesosiderite History: Fabien Kuntz purchased 4 fragments weighing a total of 360.9 g from a meteorite dealer in Guelmim, Morocco in 2020. Physical characteristics: Samples are irregularly shaped and have a dark yellowish-brown oxidized exterior. A cut face shows the sample has a brecciated texture and a high abundance of sulfides. Petrography: Description and classification (A. Love, App) Sample is a breccia composed of (vol%): cm-sized angular-rounded lithic fragments and isolated mineral grains (61) set within a matrix of FeNi metal (17) and anastomosing troilite (22). Lithic fragments are allotriomorphic, coarse-grained fragments with eucrite-like mineralogy (1.5-2 mm), and impact melt breccias with intergranular textures composed of (vol%): anhedral to subhedral olivine (11); zoned and exsolved, sieve-textured Opx (40), Cpx with ragged grain boundaries; and plag (25) mineral fragments in a melt matrix. Additional minerals are chromite, troilite, taenite, kamacite, merrillite, a Si-polymorph, and ilmenite. Geochemistry: (A. Love, App) Olivine (Fa12.9±5.8, Fe/Mn=36.1±1.4, n=7), low-Ca pyroxene (Fs36.2±15.3Wo2.9±0.9, Fe/Mn=28.9±1.3, n=12); pigeonite (Fs53.0±5.7Wo7.0±1.2, Fe/Mn=28.5±2.4 n=8); high-Ca pyroxene (Fs30.0±2.3Wo39.9±1.9, Fe/Mn=30.3±1.6, n=11). plagioclase (An94.7±1.3Or0.0±0.1, n=8). Classification: Mesosiderite (estimated class A4). Based on abundance of FeNi metal, modal mineralogy and mineral compositions this is a type A mesosiderite. Based on textures of clasts, this is an impact melt (type 4). Specimens: Fabien Kuntz holds the main masses. An endcut weighing 20.75 g and a polished mount are on deposit at App. | ||||||||||||||||||||||||||||||||
| Data from: MB110 Table 0 Line 0: |
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| Institutions and collections |
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013) Kuntz: Fabien Kuntz, France; Website (private address) |
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| References: | Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Geography:
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Statistics: This is 1 of 2163 approved meteorites from Morocco (plus 32 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||||