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Northwest Africa 8171
Basic information Name: Northwest Africa 8171
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8171
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 81.9 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Martian (basaltic breccia)
Recommended:  Martian (polymict breccia)    [explanation]

This is 1 of 17 approved meteorites classified as Martian (polymict breccia).   [show all]
Search for other: Martian meteorites
Comments: Approved 23 Jan 2014
Revised 16 Nov 2018: Updated class; see NWA 7034)
Writeuphelp
Writeup from MB 103:

Northwest Africa 8171 (NWA 8171)

(Northwest Africa)

Purchased: June 2013

Classification: Martian meteorite (basaltic breccia)

History: Purchased in June 2013 in Ensisheim, France.

Physical characteristics: Nearly completely black 81.88 g stone with remnants of fusion crust. Light-colored clasts and spheroidal objects in a brecciated matrix.

Petrography: (B. Hofmann, NMBE; N. Greber, Bern): Breccia consisting of angular mineral grains (up to 2 mm), lithic clasts (often also breccias) and spheroidal objects (1-3 mm diameter) in fine-grained matrix. Minerals observed are pyroxenes, plagioclase, alkali feldspar, magnetite, ilmenite, pyrite (partially altered to goethite).

Geochemistry: Orthopyroxene (Fs21.3-45.6Wo1.9-4.0, FeO/MnO = 27-43; n = 13), pigeonite (Fs30.9-37.1Wo6-9, FeO/MnO = 34-42; n = 4), augite (Fs8.4-29.7, Wo38-45, FeO/MnO = 13-41; n = 8), plagioclase (An1.7-52.7Or1.5-10.5; n = 22), alkali feldspar (An4.0Or73.9; n = 4). Bulk analysis (XRF, n=6) gives Fe/Mn (wt) = 46.0±3.4, Ni = 510±56 ppm, Cr = 1485±85 ppm. Oxygen isotopes: (R. Greenwood, OU) gave δ18O=7.18±0.31, δ17O=4.41±0.16, Δ17O= 0.675±0.001 (mean of 2 analyses, all per mil).

Classification: Martian (basaltic breccia). Closely resembles NWA 7034 and pairings and is very likely paired with these stones.

Specimens: 16.50 g including one polished section at NMBE. Remaining material is held by Marc Jost and Beat Booz.

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Ensisheim, France
Date:P June 2013
Mass (g):81.88
Pieces:1
Class:Martian (basaltic breccia)
Ferrosilite (mol%):21-46
Wollastonite (mol%):2-4
Classifier:B. Hofmann, NMBE; N. Greber, Bern
Type spec mass (g):16.50
Type spec location:NMBE
Main mass:Marc Jost, Beat Booz
Comments:Submitted by Beda Hofmann
Plots: O isotopes:  
Institutions
   and collections
NMBE: Natural History Museum Bern Bernastrasse 15 CH-3005 Bern Switzerland, Switzerland; Website (institutional address; updated 2 Mar 2012)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
Bern: University of Bern, University of Bern, Hochschulstrasse 4, CH-3012 Bern, Switzerland (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Alan Mazur   
Auricular   
Beat Booz                  
Denis gourgues         
Dominik Stoeckli   
Gregor H.   
John A. Shea   
Solar Anamnesis   
Space Jewels   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6968 approved meteorites from (Northwest Africa) (plus 2012 unapproved names)

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