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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 11 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)
tett   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9914 approved meteorites from (Northwest Africa) (plus 1841 unapproved names)

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