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Northwest Africa 11471
Basic information Name: Northwest Africa 11471
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11471
Observed fall: No
Year found: 2017
Country: Mali
Mass:help 345 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  LL3
Recommended:  LL3    [explanation]

This is 1 of 462 approved meteorites classified as LL3.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 3 Nov 2017
Writeuphelp
Writeup from MB 106:

Northwest Africa 11471 (NWA 11471)

Mali

Purchased: February 2017

Classification: Ordinary chondrite (LL3)

History: Purchased from Aziz Habibi in February of 2017 in Morocco. Reportedly found in Mali in early 2017.

Physical characteristics: Six identical appearing pieces. Weathered exterior with many chondrules exposed. Saw cut reveals numerous densely packed chondrules in a dark brown groundmass.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows may porphyritic chondrules, average apparent chondrule diameter 790±450 μm (n=15). Opaque, fine grained matrix present.

Geochemistry: (C. Agee and A. Santos, UNM) Olivine Fa12.9±7.7, Mn/Fe=45±18, Cr2O3=0.16±0.09 wt%, n=21; low Ca pyroxene Fs10.8±12.4Wo1.4±1.6, n=6.

Classification: Ordinary chondrite (LL3), subtype>3.2 based on Cr2O3 in ferroan olivine, Grossman and Brearley (2005).

Specimens: 30.5 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:Morocco
Date:P February 2017
Mass (g):345.4
Pieces:6
Class:LL3
Shock stage:S3
Weathering grade:W2
Fayalite (mol%):12.9±7.7
Ferrosilite (mol%):10.8±12.4
Wollastonite (mol%):1.4±1.6
Classifier:C. Agee, UNM
Type spec mass (g):30.5
Type spec location:CSFK
Main mass:Zsolt Kereszty
Comments:Field name ZK-12; 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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Geography:

Mali
Coordinates:Unknown.

Statistics:
     This is 1 of 97 approved meteorites from Mali (plus 2 unapproved names)

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