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Northwest Africa 11469
Basic information Name: Northwest Africa 11469
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11469
Observed fall: No
Year found: 2016
Country: Algeria
Mass:help 640 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  CO3
Recommended:  CO3    [explanation]

This is 1 of 554 approved meteorites (plus 1 unapproved name) classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 3 Nov 2017
Writeuphelp
Writeup from MB 106:

Northwest Africa 11469 (NWA 11469)

Algeria

Purchased: 2016 Aug

Classification: Carbonaceous chondrite (CO3)

History: Purchased from Abdeltif Mechaguen in August of 2016 in Mauritania. Reportedly found in Algeria in 2016.

Physical characteristics: Many identical appearing fragments in the range 4-52 g. Weathered exterior; saw cuts reveal numerous small chondrules set in a brown groundmass.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows may porphyritic chondrules, most in the size range 50-300 μm. Fine grained matrix makes up ~40% of this meteorite.

Geochemistry: (C. Agee and A. Santos, UNM) Olivine Fa24.1±16.7, Mn/Fe=97±32, Cr2O3=0.10±0.15 wt%, n=40; low Ca pyroxene Fs9.3±13.5Wo1.3±1.2, n=11; high Ca pyroxene Fs1.3±0.5Wo46.5±0.6, n=3.

Classification: Carbonaceous chondrite (CO3), subtype >3.2 based on the Cr2O3 in olivine, Grossman and Brearley (2005).

Specimens: 20 g on deposit at CSFK, Zsolt Kereszty holds the main mass.

Bibliography:
  • Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)
Data from:
  MB106
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2016 Aug
Mass (g):640
Pieces:Many
Class:CO3
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):24.1±16.7
Ferrosilite (mol%):9.3±13.5
Wollastonite (mol%):1.3±1.2
Classifier:C. Agee, UNM
Type spec mass (g):20
Type spec location:CSFK
Main mass:Zsolt Kereszty
Comments:Field name ZK-10; submitted by C. Agee, UNM
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
CSFK: Research Center for Astronomy and Earth Sciences, H-1121 Budapest, Konkoly Thege Miklós út 15-17.l Hungary, Hungary (institutional address; updated 7 Apr 2015)
Catalogs:
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Zsolt Kereszty   
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1017 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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