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| Northwest Africa 13741 | |||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 13741 This is an OFFICIAL meteorite name. Abbreviation: NWA 13741 Observed fall: No Year found: 2020 Country: Mauritania Mass:  257 g | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 8 approved meteorites classified as LL3-5. [show all] Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||||||||||||
| Comments: | Approved 13 Feb 2021 | ||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 110:
Northwest Africa 13741 (NWA 13741) Mauritania Purchased: 2020 Classification: Ordinary chondrite (LL3-5) History: Ten samples weighing a total of 256.8 g were found and subsequently purchased by John Higgins in November of 2020. Physical characteristics: Some samples are partially covered by a wind-ablated, weathered, dark brown fusion crust (one showing orientation). The cut face is light gray and shows abundant chondrules, sparse clasts and un-weathered metal and sulfide grains. Petrography: Description and classification (A. Love, App) Sample is a chondrite breccia composed of clasts of: equilibrated chondrite and impact melt set within a host of unequilibrated chondrules, fragments and clastic matrix. Host chondrules (avg. dia. 793 µm, n= 65) contain isotropic glass, abundant clinoenstatite and sulfide rims. Type 5 Clasts are recrystallized with barely discernible chondrules (avg diameter 864µm, n=27), rare clinoenstatite and secondary plagioclase with an avg. grainsize 50µm, n=24). Additional minerals are: high Ca pyroxene, FeNi metals, troilite, chromite (Ti-bearing) and apatite. Geochemistry: Host: Olivine (Fa18.3±15.6 (range Fa0.6-45.5), Fe/Mn=59.1±32.6, n=14); low Ca pyroxene (Fs13.9±11.8Wo0.9±0.7, Fe/Mn=20.3±9.3, n=9). Clasts: Olivine (Fa29.5±0.8, Fe/Mn=53.9±2.6, n=10); low Ca Pyroxene (Fs24.3±1.6Wo2.0±0.9, Fe/Mn=37.2±0.1 n=10). Classification: Ordinary chondrite (LL3-5, C-S3, W1) Chondrule diameter, magnetic susceptibility and mineral compositions indicate LL. Unequilibrated host (type 3), and recrystallized clasts with poorly equilibrated pyroxenes and rare clinoenstatite suggesting type 5. Specimens: John Higgins holds the main masses. 3 fragments weighing a total of 24.53 g and a polished thin section 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 166 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters) | ||||||||||||||||||||||||||||||