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Northwest Africa 3161
Basic information Name: Northwest Africa 3161
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 3161
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 1815 g
Classification
  history:
Meteoritical Bulletin:  MB 91  (2007)  OC3
Recommended:  OC3    [explanation]

This is 1 of 10 approved meteorites classified as OC3.   [show all]
Search for other: Ordinary chondrites, Ordinary chondrites (type 3)
Comments: Approved 28 Mar 2007
Revised 24 Apr 2007: Revised nomenclature for classification
Writeuphelp
Writeup from MB 91:

Northwest Africa 3161

Morocco or Algeria

Find: August 2005

Ordinary chondrite (type 3)

History: Purchased in August 2005 by Greg Hupé from a Moroccan dealer in Ouarzazate.

Physical characteristics: Seventeen stones with black fusion crust weighing a total of 1815 g.

Petrography: (A. Irving and S. Kuehner, UWS) Complex specimen consisting of well-formed olivine and orthopyroxene-bearing chondrules with rare altered metal and troilite.

Mineral compositions and geochemistry: There is a very wide range in mafic silicate compositions with olivine (Fa0– Fa35), orthopyroxene (Fs1–Fs22). Silicate glass within chondrules ranges in composition from Ca-Al-rich to Na-Al-rich. Oxygen isotopes: (D. Rumble, CIW) Analyses of two acid-washed whole rock fragments by laser fluorination gave, respectively, δ18O = 5.49, 5.34; δ17O = 4.01, 3.93; Δ17O = 1.119, 1.118 (all ‰). Although oxygen isotope compositions are similar to those of LL chondrites, this specimen contains so little metal that it does not appear to be a typical ordinary chondrite.

Classification: Ordinary chondrite (type 3); S1, W1.

Type specimens: A total of 21.1 g of sample and one polished thin section are on deposit at UWS. G. Hupé holds the main mass.

Data from:
  MB91
  Table 2
  Line 153:
Date:2005 Aug
Mass (g):1815
Pieces:17
Class:OC type 3
Shock stage:S1
Weathering grade:W1
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):21.1
Type spec location:UWS
Main mass:G. Hupé
Plots: O isotopes:  
Institutions
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
The Hupe Collection      
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
aranemac Photo added 19 Apr 2022
Gerald Armstrong Photo added 19 Apr 2022
Photo added 19 Apr 2022
Photo added 19 Apr 2022
METEORITES AUSTRALIA Photo added 19 Apr 2022
tett   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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