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Northwest Africa 7401 | |||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 7401 This is an OFFICIAL meteorite name. Abbreviation: NWA 7401 Observed fall: No Year found: 2012 Country: Morocco Mass: ![]() | ||||||||||||||||||||||||
Classification history: |
This is 1 of 25 approved meteorites classified as EL-melt rock. [show all] Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), Enstatite-rich meteorites, and Melted chondrites | ||||||||||||||||||||||||
Comments: |
Approved 12 Oct 2012 Revised 2 Sep 2019: Reclassified as another AH 001 pairing | ||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 101:
Northwest Africa 7401 (NWA 7401) Morocco Purchased: May 2012 Classification: Enstatite chondrite (EL6) History: Purchased by Sean Tutorow in Morocco, May 2012. Physical characteristics: 150 matched stones found together, weathered exterior, saw cut reveals light-gray, very fine grained texture, a few scattered light-colored chondrules, numerous small voids, friable. Petrography: (C. Agee, UNM) SEM examination of a saw cut surface shows a distinct 3 mm radial pyroxene chondrule set in a matrix dominated by orthopyroxene, with accessory plagioclase. Plagioclase to 300 μm. No other chondrules with discernable outlines observed in the section. Matrix pyroxenes to ~100 microns; chondrule pyroxenes mostly elongate prisms to ~1 mm. Ubiquitous daubreelite, Si-bearing kamacite, and taenite. Minor schreibersite and K-rich sulfide (possibly djerfisherite). Some oxide and sulfate weathering products present on grain boundaries. Geochemistry: (C. Agee and M. Spilde, UNM) Enstatite Fs0.6Wo3.4; plagioclase Or6.8Ab71.1An22.0; kamacite Si=1.16, Ni=5.05 (wt%). Classification: Enstatite chondrite (EL6), EL based on Si content of kamacite, type 6 based on absence of significant glass or olivine in the single analyzed chondrule and large plagioclase grains. This meteorite shares some textural similarities with Al Haggounia 001, although its plagioclase composition is significantly higher in An. Specimens: 39.53 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass. Writeup from MB 108: Northwest Africa 7401: reclassification
Rubin (2016) reclassified Al Haggounia 001 and paired specimens as "vesicular, incompletely melted, EL chondrite impact melt rock[s]." NWA 7401 is likely paired, and is therefore also reclassified. | ||||||||||||||||||||||||
Bibliography: |
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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) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015 Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Photos: |
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Geography:![]() |
Statistics: This is 1 of 2012 approved meteorites from Morocco (plus 35 unapproved names) (plus 1 impact crater) |