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Northwest Africa 7193
Basic information Name: Northwest Africa 7193
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7193
Observed fall: No
Year found: 2012
Country: (Northwest Africa)
Mass:help 107.8 g
Meteoritical Bulletin:  MB 102  (2013)  Eucrite-an
Recommended:  Eucrite-an    [explanation]

This is 1 of 16 approved meteorites classified as Eucrite-an.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 4 Jun 2013
Writeup from MB 102:

Northwest Africa 7193 (NWA 7193)

(Northwest Africa)

Purchased: 2012 Jan

Classification: HED achondrite (Eucrite, anomalous)

History: Purchased by GHupé in 2012 January from a Moroccan dealer at the Tucson Gem and Mineral Show.

Petrography: Fresh clast-rich breccia consisting of large clasts of medium-grained, ophitic to intersertal diabasic eucrite within a very sparse fragmental matrix. The clasts are composed of prismatic, complexly-zoned pyroxene, calcic plagioclase laths, fayalitic olivine, ilmenite, iron sulfide, Ni-free metal and regions of dark mesostasis.

Geochemistry: Orthopyroxene cores (Fs29.0Wo4.6; FeO/MnO = 28), pigeonite (Fs32.5Wo6.2; FeO/MnO = 31); subcalcic augite (Fs56.7Wo30.9; FeO/MnO = 32) with ferroan pigeonite rims (Fs53.1Wo18.1; FeO/MnO = 29); olivine (Fa81.4 ; FeO/MnO = 42). Oxygen isotopes (R. Tanaka, OkaU): analyses of acid-washed subsamples by laser fluorination gave δ17O 1.78, 1.84; δ18O 3.81, 3.81; Δ17O -0.228, -0.163 per mil.

Classification: Basaltic eucrite (anomalous). This specimen is unusual because of its diabasic texture and complexly-zoned pyroxenes.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2012 Jan
Mass (g):107.8
Shock stage:low
Weathering grade:low
Fayalite (mol%):81.4
Ferrosilite (mol%):29.0; 32.5; 56.7
Wollastonite (mol%):4.6; 6.2; 30.9
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.1
Type spec location:UWB
Main mass:GHupé
Comments:GH-428; 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)
GHupé: Gregory M. Hupé, 9003 Placid Lakes Blvd., Lake Placid, FL 33852, United States; Website (private address)
OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 9746 approved meteorites from (Northwest Africa) (plus 1855 unapproved names)

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