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Northwest Africa 7900 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 7900 This is an OFFICIAL meteorite name. Abbreviation: NWA 7900 Observed fall: No Year found: 2013 Country: Morocco Mass: 899 g | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 2930 approved meteorites (plus 2 unapproved names) classified as LL6. [show all] Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||||
Comments: | Approved 3 Jun 2013 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 102:
Northwest Africa 7900 (NWA 7900) Morocco Purchased: 2013 Classification: Ordinary chondrite (LL6) History: Purchased by Blaine Reed in Tucson, 2013. Physical characteristics: Single stone, weathered black fusion crust, saw cut reveals breccia, with many dark angular clasts, up to ~1-cm, set in light-gray, fine-grained matrix, some oxidized. Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous texturally equilibrated clasts set in a brecciated, cataclastic matrix. Accessory high-Ca pyroxene, chromite, troilite, and Fe,Ni metal. Geochemistry: (C. Agee and L. Burkemper, UNM) Groundmass: olivine Fa32.1±0.2, Fe/Mn=60±2, n=6; low-Ca pyroxene Fs25.2±0.2Wo1.9±0.1, Fe/Mn=38±2, n=5; clasts: olivine Fa31.8±0.3, Fe/Mn=64±1, n=6; low-Ca pyroxene Fs25.2±0.6Wo2.0±0.1, Fe/Mn=37±1, n=5. Classification: Ordinary chondrite (LL6), monomict breccia, although the clasts and groundmass are texturally distinct, they are geochemically identical based on olivine and pyroxenes compositions, weathering grade W2. Specimens: 35.4 g including a probe mount on deposit at UNM, Reed holds the main mass. | ||||||||||||||||||||||||||||
Data from: MB102 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) Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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Geography: |
Statistics: This is 1 of 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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