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Northwest Africa 4422 | |||||||||||||||
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Basic information | Name: Northwest Africa 4422 This is an OFFICIAL meteorite name. Abbreviation: NWA 4422 Observed fall: No Year found: 2006 Country: Morocco Mass: ![]() | ||||||||||||||
Classification history: |
This is 1 of 119 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![]() |
Writeup from MB 93:
Northwest Africa 4422 ~32°16'N, ~3°28'W Morocco 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: MB93 Table 2 Line 44: |
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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) MNHN: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 93, MAPS 43, 571-632 (2008)
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Geography:![]() |
Statistics: This is 1 of 10 approved meteorites from Oriental, Morocco This is 1 of 1929 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater) | ||||||||||||||
Proximity search: |