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Northwest Africa 7401
Basic information Name: Northwest Africa 7401
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7401
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 996 g
Classification
  history:
Meteoritical Bulletin:  MB 101  (2012)  EL6
Recommended:  EL-melt rock    [explanation]

This is 1 of 13 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
Writeuphelp
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:
  • Rubin A.E. (2016) Impact melting of the largest known enstatite meteorite: Al Haggounia 001, a fossil EL chondrite. Meteorit. Planet. Sci. 51 1576-1587. (link)
Data from:
  MB101
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P May 2012
Mass (g):995.59
Pieces:150
Class:EL6
Ferrosilite (mol%):0.6
Wollastonite (mol%):3.4
Classifier:C. Agee, UNM
Type spec mass (g):39.53
Type spec location:UNM
Main mass:Sean Tutorow
Comments:Submitted by C. Agee
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015
Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Alpha Tauri   
Hans-Christof Gruber   
Noel Darlucio Pura   
Wang Ziyao   
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1402 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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