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Northwest Africa 2924
Basic information Name: Northwest Africa 2924
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 2924
Observed fall: No
Year found: 2005
Country: Algeria
Mass:help 180 kg
Classification
  history:
Meteoritical Bulletin:  MB 90  (2006)  Mesosiderite
Recommended:  Mesosiderite    [explanation]

This is 1 of 188 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 3 Feb 2006
Revised 4 Nov 2006: Fixed error in mass
Writeuphelp
Writeup from MB 90:

Northwest Africa 2924

Algeria

Find: 2005

Mesosiderite

History: Over 180 kg (several thousand pieces) have been recovered from a small strewn field in Algeria. The largest known piece weighs about 5000 g; most are small pieces that weigh less than 200 g.

Petrography and Geochemistry: (T. Bunch and J. Wittke, NAU) Fine-grained (<0.5 mm) matrix consists of brecciated and partially recrystallized subophitic to granular basalts that enclose larger (up to 2.5 mm) subrounded to subangular olivine (Fa28), pigeonite (Fs31Wo5.4; FeO/MnO = 25.7; Cr2O3 = 0.87, Al2O3 = 1.28 [both wt%]) that rarely shows twinning. These cataclastic basalts contain unusually calcic plagioclase (An99.3) with little FeO (<0.04 wt%); highly twinned pigeonite is compositionally similar to the much larger clast pigeonite (Fs32Wo5.7), but with very little Cr2O3 and Al2O3. Merrillite is also present. Metal blebs (Ni = 6.6 wt%) are irregular in shape and typically <2 mm in size with the exception of metal aggregates and rare, centimeter-size metal nuggets with included pigeonite.

Classification: Mesosiderite; low shock, variable degree of weathering dependent on the specimen size.

Specimens: An 85 g type specimen is on deposit at NAU. MFarmer holds a 16 kg sample.

Data from:
  MB90
  Table 2
  Line 175:
Place of purchase:Unknown
Date:2005
Mass (g):180000
Pieces:1
Class:Mes
Type spec mass (g):85
Comments:Mass was incorrect in printed bulletin
Institutions
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
MFarmer: Michael Farmer, P.O. Box 86059, Tucson, AZ 85754-6059, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
akira1988   
Anthony James   
Franco Vignato   
jean bernard Delbauve   
Jean-Michel Masson      
Mirko Graul   
Piotr gural100   
Woreczko Jan & Wadi   
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 979 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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