Meteoritical Bulletin: Entry for Northwest Africa 7955

MetSoc Home Publications Contacts

Search the Meteoritical Bulletin Database
Last update: 13 Sep 2024
Search for:	Search type:	Search limits:	Display:	Publication:
Names Text Places Classes Years	Contains Starts with Exact Sounds like	NonAntarctic Falls Non-NWAs Has strewnfield		What's new in the last:
Include past classifications in search		Has photo	Limit to approved meteorite names
Search text:

Northwest Africa 7955

Basic information

Name: Northwest Africa 7955
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7955
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass: 95.1 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	Diogenite-pm
Recommended:			Diogenite-pm [explanation]

This is 1 of 63 approved meteorites classified as Diogenite-pm. [show all]
Search for other: Achondrites, Diogenites, and HED achondrites

Comments:

Approved 14 Nov 2013

Writeup

Writeup from MB 102:

Northwest Africa 7955 (NWA 7955)

(Northwest Africa)

Purchased: 2013 Apr

Classification: HED achondrite (Diogenite, polymict)

History: Purchased by Steve Witt in April 2013 from a Moroccan dealer.

Petrography: (A. Irving and S. Kuehner, UWS) Relatively fresh fragmental breccia composed predominantly of angular diogenitic orthopyroxene grains. Minor components (<5 vol.%) include basaltic eucrite clasts, coarse pigeonite and calcic plagioclase grains derived from gabbroic eucrites, chromite, ilmenite and troilite and rare angular grains of olivine.

Geochemistry: Diogenitic orthopyroxene (Fs_20.7Wo_0.8; FeO/MnO = 33), olivine (Fa_39.6, FeO/MnO =50; Fa₄₇, FeO/MnO = 52), host orthopyroxene (Fs_51.6Wo_3.1; FeO/MnO = 32), clinopyroxene exsolution lamellae (Fs_26.5-30.6Wo_39.7-40.8; FeO/MnO = 29-35).

Classification: Diogenite (polymict).

Specimens: 22.1 g and one polished thin section are at UWB. The remainder is held by Mr. S. Witt.

Data from:
  MB102
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2013 Apr
Mass (g):	95.1
Pieces:	3
Class:	Diogenite-pm
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	39.6; 47
Ferrosilite (mol%):	20.7
Wollastonite (mol%):	0.8
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	22.1
Type spec location:	UWB
Main mass:	S. Witt
Comments:	SW13-2; 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. 102, MAPS 50, 1662, September 2015

Find references in NASA ADS:
Find references in Google Scholar:

Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Dave Johnson
Don Cuarzo
John A. Shea
Michael S. Scherman

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9921 approved meteorites from (Northwest Africa) (plus 1838 unapproved names)

Direct link to this page