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| Northwest Africa 13941 | |||||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 13941 This is an OFFICIAL meteorite name. Abbreviation: NWA 13941 Observed fall: No Year found: 2021 Country: Algeria Mass:  1695 g | ||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 84 approved meteorites classified as LL7. [show all] Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||||||||
| Comments: | Approved 29 May 2021 | ||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 110:
Northwest Africa 13941 (NWA 13941) Algeria Purchased: 2021 Classification: Ordinary chondrite (LL7) History: (C. Muñecas, Expometeoritos) A batch consisting 3 pieces of various sizes was found by a nomad in a place in northwest Africa of unknown coordinates. These meteorites were eventually purchased by Carlos Muñecas from a dealer in Tindouf. Physical characteristics: Samples are coated with a dark brown, wind ablated fusion crust. A cut face shows the interior is dark orangish brown and has a brecciated texture. Petrography: Description and classification (A. Love, App) Sample is a cataclastic breccia composed of rounded to angular clasts of texturally equilibrated chondritic debris set within a comminuted matrix of similar materials. Chondrules were not observed in thin section. Average clast size is 1466 µm. Average grainsize of secondary plagioclase is 122 µm, (n=22). Sample contains (<1vol%) angular up to 460 µm clasts of K-feldspar (2V of optical figures indicates this is microcline) grains within the comminuted matrix. Sample shows abundant poikilitic textured fragments. Additional minerals are: high Ca pyroxene, albitic plagioclase, apatite, chromite and troilite. Geochemistry: (A. Love, App) Olivine (Fa31.3±0.4, Fe/Mn=63.3±2.2, n=13); low Ca pyroxene (Fs26.4±0.7Wo2.4±0.6, Fe/Mn=38.4±1.1, n=13); high Ca Pyroxene (Fs11.6±1.2Wo43.1±1.1, n=7); plagioclase (Ab81.6±2.0Or4.3±0.7, n=4); alkali feldspar (Or90.0±6.4Ab6.8±5.3, n=10). Classification: Ordinary chondrite (LL7 breccia, C-S3, W3). Equilibrated textures, grainsize of secondary plagioclase, presence of alkali feldspar and mineral compositions indicate sample is an LL7 ordinary chondrite. Specimens: C. Muñecas (Expometeoritos) holds the 1015 g main mass. A polished thin section and 3 slices weighing 24.99 g 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) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Geography:
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Statistics: This is 1 of 1194 approved meteorites from Algeria (plus 28 unapproved names) (plus 4 impact craters) | ||||||||||||||||||||||||||||||||