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Northwest Africa 4049
Basic information Name: Northwest Africa 4049
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4049
Observed fall: No
Year found: 2003
Country: (Northwest Africa)
Mass:help 1194 g
Meteoritical Bulletin:  MB 102  (2013)  Mesosiderite-B2
Recommended:  Mesosiderite-B2    [explanation]

This is 1 of 10 approved meteorites classified as Mesosiderite-B2.   [show all]
Search for other: Class B mesosiderites, Mesosiderites, and Metal-rich meteorites
Comments: Approved 27 Jul 2013
Writeup from MB 102:

Northwest Africa 4049 (NWA 4049)

(Northwest Africa)

Purchased: Oct 2003

Classification: Mesosiderite (group B2)

History: The sample was purchased in October, 2003, from a Moroccan trader by Mr. Thompson, and a portion was donated to Cascadia on April 6, 2005.

Physical characteristics: Large cut faces show ~40% metal, sometimes in subrounded to subangular clasts up to 7 mm across, and the presence of silicate clasts up to 1 cm across, with minor rustiness overall.

Petrography: (A. Ruzicka and K. Farley, Cascadia) Thin section examination reveals lightly deformed silicate mineral and lithic clasts composed chiefly of low-Ca pyroxene, high-Ca pyroxene, and plagioclase set in a granoblastic groundmass of the same minerals. Metal is minimally weathered (grade W1).

Geochemistry: (K. Farley and A. Ruzicka, Cascadia) Phase compositions are uniform for plagioclase (An94.3±0.1 Or0.2±0.2, N=21), but more variable for low-Ca pyroxene (Wo2.8±0.9 Fs29.9±4.1 Fe/Mn =25.7±4.1, N=16) and high-Ca pyroxene (Wo39.6±8.1 Fs16.1±3.7 Fe/Mn = 17.8±2.5, N=10) (atomic units).

Classification: Stony-iron (mesosiderite). Textures and mineralogy suggest a group B mesosiderite of textural type 2.

Specimens: 55 g slice, 2 polished thin sections, and 2 butts at CascadiaThompson holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P Oct 2003
Mass (g):1194
Shock stage:low
Weathering grade:W1
Ferrosilite (mol%):29.9±4.1, 16.1±3.7
Wollastonite (mol%):2.8±0.9, 39.6±8.1
Classifier:A. Ruzicka, Cascadia
Type spec mass (g):55
Type spec location:Cascadia
Main mass:Thompson
Comments:Lab number CML0286.; submitted by A. Ruzicka
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Jean-Michel Masson   

     This is 1 of 9829 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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