Meteoritical Bulletin: Entry for Northwest Africa 4039

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Northwest Africa 4039

Basic information

Name: Northwest Africa 4039
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4039
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass: 950 g

Classification
history:

Meteoritical Bulletin:	MB 90	(2006)	Eucrite-mmict
Recommended:			Eucrite [explanation]

This is 1 of 587 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Comments:

Approved 3 Feb 2006

Writeup

help

Writeup from MB 90:

Northwest Africa 4039

Northwest Africa

Find: 2005

Achondrite (eucrite, monomict breccia)

History: Several stones totaling 950 g were found in 2005 by an anonymous finder in 2004 in the western part of the Sahara in Morocco.

Petrography: (A. Greshake, MNB) An unusual eucrite with dominantly coarse-grained basaltic texture of exsolved Ca pyroxene and plagioclase cross-cut by centimeter-size granular bands or crushed zones. Locally these zones display an equigranular texture with 120° grain boundaries; minor phases include orthopyroxene, silica, ilmenite, troilite, and Al-Ti chromite.

Geochemistry: Plagioclase (An_90.1, range An_88.3–92.6), orthopyroxene (Fs_58.1–62.2Wo_2.7–4.6), pigeonite (Fs_50.7–58.6Wo_5.2–15.7), augite (Fs_26.3–34.9Wo_32.1–44.1).

Classification: Achondrite (eucrite, monomict breccia); high shock, moderate weathering.

Specimens: A 20.1 g type specimen and one polished thin section are on deposit at MNB. An anonymous finder holds the main mass.

Data from:
  MB90
  Table 2
  Line 258:

Place of purchase:	Morocco
Date:	2005
Mass (g):	950
Pieces:	many
Class:	Euc
Shock stage:	High
Weathering grade:	moderate
Type spec mass (g):	20.1

Institutions
and collections

MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 90, MAPS 41, 1383-1418 (2006)

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

Photos:

Credit	Photos
Photos from the Encyclopedia of Meteorites:
Don Edwards
Peter Marmet
Polandmet

Geography:

Coordinates:

Unknown.

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

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