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Northwest Africa 7428 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 7428 This is an OFFICIAL meteorite name. Abbreviation: NWA 7428 Observed fall: No Year found: 2012 Country: Morocco Mass: 1830 g | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 79 approved meteorites classified as L6-melt breccia. [show all] Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||||
Comments: | Approved 4 Oct 2012 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 101:
Northwest Africa 7428 (NWA 7428) Morocco Purchased: 2012 Classification: Ordinary chondrite (L6, melt breccia) History: Purchased by Matt Morgan in Tucson 2012. Physical characteristics: Single stone, dark, shiny, fusion-crusted exterior, some vesicles, moderate desert oxidation. Saw cut shows dark-colored melt vein up to 5 cm wide containing numerous partially melted, oval shaped, chondrite clasts. Veins bounded by light brown chondrite lithology. Fine grained metal grains evenly distributed throughout the sample. Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows two main lithologies: 1) melt zones clogged with numerous rafted and partially melted PO and POP chondrules and chondrite matrix clasts, and suspended fine troilite blebs; 2) an unmelted, equilibrated, protogranular chondrite texture, with olivine, pyroxene, plagioclase, kamacite, troilite, and chromite; no distinct chondrules observed in the unmelted lithology. Geochemistry: (C. Agee and M. Spilde, UNM) EMPA. Olivine Fa25.2±0.3, Fe/Mn=50±2, n=10; orthopyroxene Fs21.5±0.2Wo1.5±0.4, Fe/Mn=30±1, n=5; plagioclase Or12.2±0.3Ab72.4±0.1An15.4±0.4, n=2. Classification: L6-melt breccia, weathering grade W2. Specimens: 116 g including a probe mount on deposit at UNM. MtMorgan holds the main mass. | ||||||||||||||||||||||||||||
Data from: MB101 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) MtMorgan: Matt Morgan, Mile High Meteorites, P.O. Box 151293, Lakewood, CO 80215-9293, United States; Website (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, 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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