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Northwest Africa 4422
Basic information Name: Northwest Africa 4422
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4422
Observed fall: No
Year found: 2006
Country: Morocco
Mass:help 147.7 g
Meteoritical Bulletin:  MB 93  (2008)  CK4
Recommended:  CK4    [explanation]

This is 1 of 109 approved meteorites classified as CK4.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites
Comments: Approved 6 Mar 2008
Revised 4 Aug 2008: final writeup
Writeup from MB 93:

Northwest Africa 4422                   ~32°16'N, ~3°28'W


Find: May 2006

Carbonaceous chondrite (CK4)

History: P. Thomas purchased one stone, said to have been found in Beni Tajjite in the province of Figuig, Morocco, in May 2006.

Physical characteristics: One complete, pyramid-shaped stone weighing 147.72 g, entirely covered with a very black fusion crust; the crust is very thin on one face.

Petrography: (M. Bourot-Denise, MNHN) Chondrule and CAI dimensions are between 500 and 1000 µm; CAIs are relatively abundant. Magnetite is the most abundant opaque; it rims chondrules and CAIs, makes up big nodules in association with sulfide, or is scattered as small angular grains in matrix and chondrule rims. Matrix is completely recrystallized. BSE images show that all silicates are equilibrated, even though the chondritic texture is well preserved. The polished section studied contains a 3000 µm diameter chondrule whose core of pyroxene laths is surrounded by a double rim peppered with small magnetites.

Geochemistry: Olivine (mean Fa30.2±0.3) and low-Ca pyroxene are homogeneous. Magnetite, Cr2O3 = 3.79, MgO = 0.16 (both in wt%), in the equilibrated CK domain. Plagioclase, An in the range 34.8-72.3. Magnetic susceptibility: (J. Gattacceca, CEREGE) = log χ = 4.93 10-9 m3/kg.

Classification: Carbonaceous chondrite (CK4); minimal shock, moderate weathering.

Type specimens: A total of 21.4 g of sample (1 sawn fragment with crust) and one polished mount are on deposit at MNHN. Thomas holds the main mass.

Submitted by: M. Bourot-Denise, MNHN.

Data from:
  Table 2
  Line 44:
Place of purchase:Found in Beni, Tajjite, Figuig, Morocco
Mass (g):147.72
Type spec mass (g):21.4
Comments:~32°16'N, ~3°28'W
   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)
MNHN: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)
References: Published in Meteoritical Bulletin, no. 93, MAPS 43, 571-632 (2008)
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Photos from the Encyclopedia of Meteorites:
Don Edwards   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Jean-Michel Masson   
Mirko Graul   

     Recommended::   (32° 16'N, 3° 28'W)

     This is 1 of 10 approved meteorites from Oriental, Morocco
     This is 1 of 1632 approved meteorites from Morocco (plus 22 unapproved names) (plus 1 impact crater)
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