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Northwest Africa 7406
Basic information Name: Northwest Africa 7406
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7406
Observed fall: No
Year found: 2010
Country: Morocco
Mass:help 356 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  EL3
Recommended:  EL3    [explanation]

This is 1 of 22 approved meteorites classified as EL3.   [show all]
Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 3), and Enstatite-rich meteorites
Comments: Approved 23 Apr 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 7406 (NWA 7406)

Morocco

Purchased: Dec 2010

Classification: Enstatite chondrite (EL3)

Physical characteristics: A single, complete, desert-varnished stone was found.

Petrography: (A.E. Rubin, UCLA) Chondrules average ~500 μm in apparent diameter which is very close to the 550-μm average chondrule diameter found for EL3 (Rubin, 2010); most are RP and PP types, but there are also rare POP chondrules and chondrule fragments. Many low-Ca pyroxene grains exhibit polysynthetic twins. The rock is so weathered that almost no opaque grains have survived -- only a few grains of troilite and metal. Kamacite: 94.2% Fe, 4.6% Ni, 0.55% Si, 0.30% Co, 0.10% P, 0.09% Cr, 0.07% Mg (n=3). Ti and Mn were below detection limits. Abundant grains of metallic copper <5 μm were observed, usually within matrix enstatite grains.

Bibliography:
  • Rubin A.E. (2010) Physical properties of chondrules in different chondrite groups: Implications for multiple melting events in dusty environments. Geochim. Cosmochim. Acta 74 4807-4828. (link)
Data from:
  MB104
  Table 0
  Line 0:
Place of purchase:Purchased from Ali Oulmaleh
Date:P Dec 2010
Mass (g):356.3
Pieces:1
Class:EL3
Shock stage:medium
Weathering grade:high
Fayalite (mol%):0.1±0.1 (n=4)
Ferrosilite (mol%):0.6±0.4 (n=15)
Wollastonite (mol%):2.4±0.6 (n=15)
Classifier:A. Rubin, UCLA
Type spec mass (g):29.72
Type spec location:UCLA
Main mass:Utas
Finder:anonymous
Comments:Submitted by JUtas
Institutions
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
JUtas: Jason Utas, United States (private address; updated 8 Jun 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1390 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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