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Northwest Africa 4290
Basic information Name: Northwest Africa 4290
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4290
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 1101 g
Classification
  history:
Meteoritical Bulletin:  MB 91  (2007)  LL3.10
Recommended:  LL3.10    [explanation]

This is 1 of 12 approved meteorites classified as LL3.10.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 1 Sep 2006
Writeuphelp
Writeup from MB 91:

Northwest Africa 4290

Morocco

Find: 2004

Ordinary chondrite (LL3.10)

History: Collected in March 2004 by the Caillou Noir team.

Physical characteristics: One crusted individual of 1101 g with some regmaglypts. Flow lines are visible on the part of the surface that was buried in the ground.

Petrography: (M. Messaoudi, USTHB; M. Denise, MNHNP; B. Devouard, UBP) Sharply defined chondrules from 0.1 to 3 mm, with a few up to 10 mm. Fine-grained dark rims outline most chondrules. Matrix is scarce. Type II chondrules are dominant (~60 vol%) and larger than type I chondrules. Chondrule mesostasis is vitreous. Metal is rare and mostly altered by terrestrial weathering. Magnetite is associated with metal in the larger opaque lumps.

Mineral compositions and geochemistry: Olivine (Fa0.4– Fa40; average Fa9 [n = 235]). No zonation was observed in the olivines of type I chondrules. Low-Ca pyroxene (Fs0.7–Fs35; average Fs8.2 [n = 80]). Analyses of Cr2O3 in olivines from type II chondrules yield an average of 0.39 ± 0.22 wt% (n = 164). Magnetic susceptibility: (P. Rochette, CEREGE) log χ (10−9 m3/kg) = 3.91.

Classification: Unequilibrated ordinary chondrite (LL3.10); S3, W3.

Type specimen: A total of 20.45 g is on deposit at MNHNP. Caillou Noir holds the main mass.

Data from:
  MB91
  Table 2
  Line 281:
Place of purchase:Morroco
Date:2005 Mar
Mass (g):1101
Pieces:1
Class:LL3.10
Shock stage:S3
Weathering grade:W3
Fayalite (mol%):0.4-40 Av. = 9
Ferrosilite (mol%):0.7-35 Av. = 8.2
Magnetic suscept.:3.91
Classifier:M. Messaoudi, USTB; M. Denise MNHNP, B. Devouard, UBP
Type spec mass (g):20.45
Type spec location:MNHNP
Main mass:Caillou Noir
Finder:Caillou Noir Team
Institutions
   and collections		 CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 10 Jun 2023)
MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)
Caillou Noir: Caillou Noir 100 Chemin des Campenes, 74400 Chamonix, France; Website (private address)
UBP: Universite Blaise Pascal, Clermont-Ferrand, France (institutional address)
USTB: Université des Sciences et de la Technologie Houari Boumediene, Algers, Algeria; Website (institutional address)
USTHB: Université des Sciences et de la Technologie Houari Boumediene, Algers, Algeria; Website (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Michel Franco   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9921 approved meteorites from (Northwest Africa) (plus 1838 unapproved names)

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