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Northwest Africa 7025
Basic information Name: Northwest Africa 7025
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7025
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 79 g
Meteoritical Bulletin:  MB 102  (2013)  Mesosiderite
Recommended:  Mesosiderite    [explanation]

This is 1 of 273 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 6 Sep 2013
Writeup from MB 102:

Northwest Africa 7025 (NWA 7025)

(Northwest Africa)

Purchased: 2011 Apr

Classification: Mesosiderite

History: Purchased by Ralew from a dealer in Erfoud, Morocco in 2011 April.

Petrography: (A. Irving and S. Kuehner, UWS) The specimen contains two distinct domains in contact along curvilinear boundaries. One lithology consists predominantly of orthopyroxene with subordinate anorthite, ~25 vol.% troilite+metal (kamacite and taenite as small cuspate grains), accessory chromite and merrillite. Other portions of the specimen have similar mineralogy, except that most of the troilite and metal has been replaced by small cuspate voids.

Geochemistry: Orthopyroxene (Fs26.3-26.5Wo2.9-3.1, FeO/MnO = 26-28). Oxygen isotopes (R. Tanaka, OkaU): analyses of acid-washed subsamples by laser fluorination gave δ17O 1.961, 1.847, 2.082; δ18O 4.149, 3.992, 4.387; Δ17O -0.223, -0.255, -0.228 per mil.

Classification: Mesosiderite. Parts of this specimen have mineralogy, mineral compositions and an oxygen isotopic composition consistent with mesosiderites, but other parts with the same silicate mineralogy have voids in place of former troilite and metal (probably indicative of selective terrestrial weathering).

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2011 Apr
Mass (g):79
Shock stage:low
Weathering grade:moderate
Ferrosilite (mol%):26.3-26.5
Wollastonite (mol%):2.9-3.1
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):16.2
Type spec location:UWB
Main mass:S. Ralew
Comments:SR11-6; submitted by A. Irving
Plots: O isotopes:  
   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)
UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)
OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 9689 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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