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Northwest Africa 4722
Basic information Name: Northwest Africa 4722
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4722
Observed fall: No
Year found: 2006
Country: Morocco
Mass:help 294 g
Classification
  history:
Meteoritical Bulletin:  MB 94  (2008)  LL3
Recommended:  LL3    [explanation]

This is 1 of 313 approved meteorites classified as LL3.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 8 Sep 2008
Writeuphelp
Writeup from MB 94:

Northwest Africa 4722

Morocco

Find: January 2006

Ordinary chondrite (LL3)

History: Stones were purchased in Erfoud by C. Giessler in January 2006.

Physical characteristics: 48 small, crusted stones with brownish interiors, totaling 294 g.

Petrography: (M. Bourot-Denise, MNHNP) The meteorite displays a homogeneous texture with mm-sized chondrules. BSE images point to an unequilibrated chondrite, with large type II FeO-rich chondrules, and small (<500 μm in size) type I, FeO-poor chondrules. In the type I chondrules, olivines are sometimes zoned. Rare metal and sulfide occur in large nodules (100–200 μm). Terrestrial alteration has significantly affected the matrix and the opaque minerals in the matrix.

Geochemistry: Olivine, Fa13.5 ± 11.1, range Fa0.8–36.5, CaO up to 0.18, Cr2O3 = 0.15 (both wt%); low-Ca pyroxene, Fs10.3 ± 9.5, range Fs1.1–27.7. Magnetic susceptibility: (J. Gattacceca, CEREGE) logχ = 3.23 (10-9 m3/kg) is consistent with a weathered LL chondrite.

Classification: Ordinary chondrite (LL3, estimated subtype 3.4); weathering grade W3; shock stage S1.

Type specimens: A total of 24.3 g of sample (4 sawn fragments) and one polished mount are on deposit at MNHNP. C. Giessler holds the main mass.

Data from:
  MB94
  Table 2
  Line 54:
State/Prov/County:Morocco
Date:2006
Mass (g):294
Pieces:48
Class:LL3
Shock stage:S1
Weathering grade:W3
Fayalite (mol%):0.8-36.5
Ferrosilite (mol%):1.1-27.7
Classifier:M. Bourot-Denise, MNHNP
Type spec mass (g):24.3
Type spec location:MNHNP
Main mass:Giessler
Institutions
   and collections
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Gipo Meteorites   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Anthony James   
Charley Kettel   
Dirk Hohmann      
Gerald Armstrong      
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1370 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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