Meteoritical Bulletin: Entry for Northwest Africa 7193

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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: 107.8 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	Eucrite-an
Recommended:			Eucrite-an [explanation]

This is 1 of 15 approved meteorites classified as Eucrite-an. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 4 Jun 2013

Writeup

help

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 (Fs_29.0Wo_4.6; FeO/MnO = 28), pigeonite (Fs_32.5Wo_6.2; FeO/MnO = 31); subcalcic augite (Fs_56.7Wo_30.9; FeO/MnO = 32) with ferroan pigeonite rims (Fs_53.1Wo_18.1; FeO/MnO = 29); olivine (Fa_81.4; 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:
  MB102
  Table 0
  Line 0:

Place of purchase:	Tucson
Date:	P 2012 Jan
Mass (g):	107.8
Pieces:	1
Class:	Eucrite-an
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:

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)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
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)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015

Find references in NASA ADS:
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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9305 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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