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| Northwest Africa 11905 | |||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 11905 This is an OFFICIAL meteorite name. Abbreviation: NWA 11905 Observed fall: No Year found: 2017 Country: (Northwest Africa) Mass:  6.97 kg | ||||||||||||||||||||||||||||||
| Classification history: |
This is the only approved meteorite classified as LL3.10-5. Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||||||||||||
| Comments: | Approved 2 Sep 2018 | ||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 107:
Northwest Africa 11905 (NWA 11905) (Northwest Africa) Purchased: 2017 Classification: LL3.10-5 History: Purchased by Matthew Martin, February 2017, in Tucson from a Moroccan meteorite dealer. Physical characteristics: Single stone. Saw cuts show a breccia of visually different chondrite clasts set in a host chondrite groundmass. Some of the clasts appear to be texturally equilibrated with less distinct chondrules, whereas others resemble type-3 lithologies with densely packed chondrules. The host groundmass contains numerous large, distinct, well-formed chondrules. Petrography: (C. Agee, UNM) Microprobe examination of several polished mounts shows three group LL lithologies present: Lithology 1 is LL3.10; Lithology 2 is LL5; and Lithology 3 makes up the host groundmass and is LL3. Lithology 1 has numerous porphyritic chondrules, most with mesostasis or glass and abundant opaque matrix. The apparent mean chondrule diameter in Lithology 1 is 900±400 μm, n=31. Lithology 2 has texturally equilibrated chondrules and plagioclase grains up to 25 μm. Lithology 3 (host) has numerous porphyritic chondrules, many with mesostasis, fine-grained plagioclase also detected. Geochemistry: (C. Agee, UNM) Lithology 1: all olivine Fa14.0±11.0, Fe/Mn=41±15, n=44; ferroan chondrule olivine Fa17.3±9.9, Fe/Mn=45±13, Cr2O3=0.32±0.20 (wt%), n=35; low-Ca pyroxene Fs11.1±10.0Wo1.1±0.8, n=12. Lithology 2: olivine Fa30.7±0.6, Fe/Mn=60±2, n=19; low-Ca pyroxene Fs24.9±0.3Wo1.3±0.9, n=12. Lithology 3: olivine Fa27.9±3.0, Fe/Mn=57±15, n=8; low-Ca pyroxene Fs24.3±1.8Wo2.1±3.5, n=4. Classification: Ordinary chondrite (LL3.10-LL3-LL5), LL-group genomict breccia. Type 3.10 for Lithology 1 is based on the mean value of Cr2O3 in ferroan chondrule olivine and the 1-sigma standard deviation, (Grossman and Brearley, 2005), a similar petrologic type to NWA 1756 (LL3.10), NWA 3127 (LL3.10), RC 075 (H3.10), and MET 96503 (L3.10). Estimated type for Lithology 3 is 3.8/3.9 based on the scatter in olivine composition. Specimens: 48.5 g on deposit at UNM, Matthew Martin holds the main mass. | ||||||||||||||||||||||||||||||
| Bibliography: |
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| Data from: MB107 Table 0 Line 0: |
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| Institutions and collections |
UNM: Institute of Meteoritics
MSC03 2050
University of New Mexico
Albuquerque NM 87131-1126
USA, United States; Website (institutional address; updated 12 Feb 2015) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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| Geography: |
Statistics: This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names) | ||||||||||||||||||||||||||||||
| Crosslinks: |
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| Revision history: |
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