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Northwest Africa 4423
Basic information Name: Northwest Africa 4423
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4423
Observed fall: No
Year found: 2006
Country: Morocco
Mass:help 91.9 g
Meteoritical Bulletin:  MB 93  (2008)  CK3
Recommended:  CK3    [explanation]

This is 1 of 50 approved meteorites classified as CK3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CK chondrites, CK3 chondrites, and CV-CK clan chondrites
Comments: Approved 6 Mar 2008
Revised 4 Aug 2008: final writeup
Writeup from MB 93:

Northwest Africa 4423


Find: May 2006

Carbonaceous chondrite (CK3)

History: A stone, said to have been found near Hammada du Guir, Morocco, was purchased by P. Thomas in May 2006.

Physical characteristics: One stone, weighing 91.94 g, entirely covered with a very black fusion crust.

Petrography: (M. Bourot-Denise, MNHN) Chondrules and CAIs are clearly visible to the naked eye and are mm-sized; CAIs are particularly abundant. Magnetite, the most abundant opaque mineral, makes large nodules around chondrules or, in association with sulfides (mostly pyrrhotite), in the matrix; it is also found as smaller grains rimming chondrules, AOAs and CAIs, and in chondrule rims; very small flecks of magnetite are located in a few areas of finer matrix. In BSE images, the chondrite appears not to be completely equilibrated, with zoned olivines and low-Ca pyroxenes in POP chondrules. Outside chondrules, high-Ca pyroxene is augite and diopside. The studied polished section features a large CAI, 3000 µm in size, rimmed with small magnetites.

Geochemistry: Olivine (mean Fa = 16.4 ± 12.7, range 0.31- 32.7), low-Ca pyroxene (Fs = 7.9 ± 8.6, range 1.1-24.1; magnetite (Cr2O3 = 2.35, MgO = 0.84 [both in wt%]), plagioclase (An22.6-77.6). Magnetic susceptibility: (J. Gattacceca, CEREGE) = log χ = 4.7 10-9 m3/kg.

Classification: Carbonaceous chondrite (CK3; estimated subtype 3.8); minimal shock and moderate weathering.

Type specimens: A total of 19.1 g of sample (4 sawn fragments) and one polished mount is on deposit at MNHN. Thomas holds the main mass.

Submitted by: M. Bourot-Denise, MNHN.

Data from:
  Table 2
  Line 45:
Place of purchase:Found in Hammada du Guir, Morocco
Mass (g):91.91
Type spec mass (g):19.1
   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   


     This is 1 of 1503 approved meteorites from Morocco (plus 22 unapproved names) (plus 1 impact crater)

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