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| Northwest Africa 10811 | |||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 10811 This is an OFFICIAL meteorite name. Abbreviation: NWA 10811 Observed fall: No Year found: 2016 Country: Algeria Mass:  285 g | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||||
| Comments: | Approved 24 Sep 2016 | ||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 105:
Northwest Africa 10811 (NWA 10811) Algeria Purchased: 2016 Classification: HED achondrite (Eucrite) History: One stone weighing 285.1 g was found in Algeria. Thomas Webb purchased the stone from meteorite dealer in Morocco in February 2016. Physical characteristics: The stone is lacking an obvious fusion crust. The exterior is irregular in shape and contains numerous depressions that are clasts. The interior viewed from a cut face shows green-colored clasts up to 3.5 cm in diameter set within in a dark-gray matrix containing small vesicles. Petrography: Description and classification (A. Love, App): Sample is a monomict breccia composed of subrounded clasts of very fine-grained, (pyroxenes and ~200 μm lath-shaped plagioclase) ophitic-textured clasts. Pyroxenes are 50-100 μm and exsolved. Lath-shaped plagioclase crystals are ~200 μm and have been partially converted to maskelynite. Melt matrix is composed of lithic fragments and mineral grains set within a quenched, dark-colored glass. Accessory minerals are ilmenite, troilite, a Si polymorph, chromite. Geochemistry: (A. Love, App): Augite Fs27.2±1.3Wo42.0±1.6 Fe/Mn=30.2-34.3 N=13 appears as individual grains and exsolution lamellae within orthopyroxene. Orthopyroxene Fs60.6±1.2Wo2.8±1.0 Fe/Mn=31.1-33.4, N=13 also appears as individual grains and exsolution lamellae within Cpx. Anorthite An89.7±0.4 N=5 Classification: Mineralogy, geochemistry and textures are consistent with equilibrated eucrites. Quenched vesicular melt matrix with entrained mineral and lithic clasts indicates this is a monomict eucrite impact melt breccia. Quenched vesicular melt matrix with entrained mineral and lithic clasts indicates this is a monomict eucrite impact melt breccia. Specimens: Webb holds the main mass. A polished thin section, two slices and two small fragments weighing 20.85g are on deposit at App. | ||||||||||||||||||||||||||||||
| Data from: MB105 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) TWebb: No contact information provided., United States (private address) |
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| References: | Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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Geography:
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Statistics: This is 1 of 1250 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters) | ||||||||||||||||||||||||||||||