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Northwest Africa 7907
Basic information Name: Northwest Africa 7907
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7907
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 29.9 g
Meteoritical Bulletin:  MB 102  (2013)  Martian (basaltic breccia)
MB 107  (2018)  Martian (polymict breccia)
Recommended:  Martian (polymict breccia)    [explanation]

This is 1 of 18 approved meteorites classified as Martian (polymict breccia).   [show all]
Search for other: Martian meteorites
Comments: Approved 19 Jun 2013
Revised 16 Nov 2018: Updated class; see NWA 7034)
Writeup from MB 102:

Northwest Africa 7907 (NWA 7907)

(Northwest Africa)

Purchased: Jan 2013

Classification: Martian meteorite (basaltic breccia)

History: Purchased in January 2013 by Marc Jost in Morocco

Physical characteristics: Black 29.94 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 of angular mineral grains (to 4 mm), lithic clasts and spheroidal objects (2-5 mm diameter) in fine-grained matrix. Minerals observed are pyroxenes, plagioclase, alkali feldspar, magnetite, chlorapatite, ilmenite, pyrite, maghemite, and goethite.

Geochemistry: Orthopyroxene (Fs21-55Wo2-5, FeO/MnO = 26-55; n = 16), pigeonite (Fs33-47Wo7-18, FeO/MnO = 34-52; n = 6), augite (Fs16-26Wo37-45, FeO/MnO = 28-36; n = 3), plagioclase (An29-52Or1.6-4.5; n = 14), alkali feldspar (An4.8Or53; n = 1). Bulk analysis (XRF, n=21) shows Fe/Mn (wt) = 44.7, Ca/Si = 0.22, Mg/Si = 0.20, Ni = 550 ppm, Cr = 1680 ppm. Oxygen isotopes: (R. Greenwood, OU) gave δ18O = 6.27, δ17O = 3.89, Δ17O = 0.60 (all per mil).

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

Specimens: 8.20 g and one polished thin section at NMBE. Remaining material is held by Marc Jost.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P Jan 2013
Mass (g):29.94
Class:Martian (basaltic breccia)
Shock stage:S2
Ferrosilite (mol%):21-55
Wollastonite (mol%):2-5
Classifier:B. Hofmann NMBE; N. Greber, Bern
Type spec mass (g):8.20
Type spec location:NMBE
Main mass:Marc Jost
Comments:Submitted by Beda Hofmann
Plots: O isotopes:  
   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)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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