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Northwest Africa 7491
Basic information Name: Northwest Africa 7491
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7491
Observed fall: No
Year found: 2012
Country: Morocco
Mass:help 306 g
Classification
  history:
Meteoritical Bulletin:  MB 101  (2012)  L6
Recommended:  L6    [explanation]

This is 1 of 11283 approved meteorites (plus 6 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 18 Oct 2012
Writeuphelp
Writeup from MB 101:

Northwest Africa 7491 (NWA 7491)

Morocco

Purchased: May 2012

Classification: Ordinary chondrite (L6)

History: Purchased by Sean Tutorow in Morocco, May 2012.

Physical characteristics: Two matching fragments, with shiny, smooth fusion crust, saw cut reveals finely disseminated metal/sulfide and many chondrules, some up to 4mm, set in a light gray matrix. Some fine weathering veins.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous equilibrated, recrystallized chondrules. Ubiquitous troilite and kamacite with moderate oxidation, accessory Cl-rich apatite and merrillite.

Geochemistry: (C. Agee and M. Spilde, UNM) Olivine Fa24.7±0.1, Fe/Mn=49±2, n=3; low-Ca pyroxene Fs20.7±0.2Wo1.5±0.3, Fe/Mn=28±1, n=3.

Classification: Ordinary chondrite (L6), weathering grade W2.

Specimens: 20.12 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass.

Data from:
  MB101
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P May 2012
Mass (g):306.46
Pieces:2
Class:L6
Weathering grade:W2
Fayalite (mol%):24.7±0.1
Ferrosilite (mol%):20.7±0.2
Wollastonite (mol%):1.5±0.3
Classifier:C. Agee, UNM
Type spec mass (g):20.12
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
Find references in NASA ADS:
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1476 approved meteorites from Morocco (plus 22 unapproved names) (plus 1 impact crater)

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