Meteoritical Bulletin: Entry for Northwest Africa 8174

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Northwest Africa 8174

Basic information

Name: Northwest Africa 8174
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8174
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass: 150 g

Classification
history:

Meteoritical Bulletin:	MB 103	(2014)	Eucrite-pmict
Recommended:			Eucrite-pmict [explanation]

This is 1 of 408 approved meteorites classified as Eucrite-pmict. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 3 Aug 2014

Writeup

help

Writeup from MB 103:

Northwest Africa 8174 (NWA 8174)

(Northwest Africa)

Purchased: 2013 Oct

Classification: HED achondrite (Eucrite, polymict)

History: Two very similar stones were purchased together by G. Fujihara (who provided portions of both as type material) in October 2013 from a dealer in Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Fragmental breccia composed predominantly of gabbroic eucrite clasts in a sparse matrix of related debris (mostly pyroxene). Minerals are exsolved pigeonite (with variable red-brown staining), calcic plagioclase (polycrystalline, birefringent), silica polymorph, ilmenite, Ti-bearing chromite, troilite and minor secondary barite.

Geochemistry: Orthopyroxene host (Fs_60.2-62.8Wo_2.6-1.9, FeO/MnO =30-32), clinopyroxene exsolution lamellae (Fs_28.2-28.3Wo_42.3-42.6, FeO/MnO = 29-30).

Classification: Eucrite (polymict, gabbroic). Based on primary textures, shock features and style of weathering, this material is likely paired with NWA 7989, NWA 8036 and NWA 8056.

Specimens: A total of 20.1 g including one polished thin section at UWB. The remaining material is held by G. Fujihara.

Data from:
  MB103
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2013 Oct
Mass (g):	150
Pieces:	2
Class:	Eucrite-pmict
Shock stage:	moderate
Weathering grade:	moderate
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	20.1
Type spec location:	UWB
Main mass:	G. Fujihara
Comments:	GF13-13; submitted by A. Irving

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, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
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