MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 27 Nov 2022
Search for: Search type: Search limits: Display: Publication:
Text help
Starts with
Sounds like
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
Northwest Africa 4477
Basic information Name: Northwest Africa 4477
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4477
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass:help 122.3 g
Meteoritical Bulletin:  MB 91  (2007)  L3-7
Recommended:  L3-7    [explanation]

This is 1 of 3 approved meteorites classified as L3-7.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 28 Mar 2007
Writeup from MB 91:

Northwest Africa 4477

Northwest Africa

Find: 2 February 2006

Ordinary chondrite (L3-7; genomict breccia)

History: Devin Schrader purchased the sample at the Tucson Gem and Mineral Show on 2 February 2006 from a Moroccan dealer.

Physical characteristics: The total mass of the meteorite before cutting was 122.25 g (two pieces, 32.50 g and 89.75 g). The color was reddish black containing lighter tan clasts.

Petrography: (D. Schrader, D. Lauretta, M. Kilgore, UAz; H. Connolly, KCCU). The meteorite contains olivine, pyroxene, plagioclase, kamacite, taenite, troilite, and Ca phosphate. In thin section there are at least four different chondritic components, including several types of clasts showing a range of grain sizes and without chondrules (~30 vol%). The main chondritic component displays brecciation representing four metamorphic grades.

Mineral compositions and geochemistry: (D. Schrader, D. Lauretta, M. Killgore, K. Domanik, and D. Hill, UAz) (EMP at UAz) The main chondritic component has olivine (Fa1.0–25.6, average = Fa20.2±7.1), pyroxene (Fs2.1–27.0, average = Fs17.5±5.7; Wo0.01–0.42, average = Wo0.04±0.09), and kamacite (average Ni = 5.4 ± 2.01, range 2.26–9.33; average Co = 0.72 ± 0. 10, range 0.39–0.89, all wt%).

Classification: Ordinary chondrite (L3-7; genomict breccia); S3, W1.

Type specimen: A total of 21.33 g (in three pieces and two thin sections) is on deposit at UAz (UA2031). D. Schrader holds the main mass of 100.92 g in five pieces.

Data from:
  Table 2
  Line 343:
Place of purchase:Tucson, Arizona
Date:2006 Feb 2
Mass (g):122.25
Shock stage:S3
Weathering grade:W1
Classifier:D. Schrader, D. Lauretta, M. Killgore, Uaz; H. Connolly, KCCU.
Type spec mass (g):21.3
Type spec location:KCCU
Main mass:DSchrader
   and collections
KCCU: Kingsborough College of the City University of New York, Brooklyn, NY 11235, United States (institutional address; updated 28 Dec 2011)
UAz: Lunar and Planetary Laboratory, University of Arizona, 1629 E. University Blvd., Tucson, AZ 85721, United States (institutional address; updated 14 Jan 2012)
DSchrader: Devin Schrader, Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, United States (private address)
Killgore: Marvin and Kitty Killgore, Southwest Meteorite Laboratory, P.O. Box 95, Payson, AZ 85547, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
Find references in NASA ADS:
Find references in Google Scholar:

     This is 1 of 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

Direct link to this page