Meteoritical Bulletin: Entry for Northwest Africa 4025

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Northwest Africa 4025

Basic information

Name: Northwest Africa 4025
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4025
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass: 746 g

Classification
history:

Meteoritical Bulletin:	MB 91	(2007)	CB
Recommended:			CB [explanation]

This is 1 of 8 approved meteorites classified as CB. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CB chondrites, CH-CB family, and Metal-rich meteorites

Comments:

Approved 28 Mar 2007

Writeup

help

Writeup from MB 91:

Northwest Africa 4025

Morocco

Find: August 2005

Carbonaceous chondrite (CB)

History: A total of 69 fragments were purchased in August 2005 from a dealer in Erfoud, Morocco.

Physical characteristics: The small, mostly angular fragments, totaling 745.5 g, display a rusty brown surface; fusion crust is almost absent.

Petrography: (A. Greshake, MNB) The meteorite is characterized by a high modal metal abundance of about 60–80 vol%. The silicate portion contains abundant, large (up to several millimeters) and clearly defined chondrules of different textural types including cryptocrystalline, BO, PO, and POP chondrules.

Mineral compositions and geochemistry: Olivine (Fa_1.7–4.4), low-Ca pyroxene (Fs_1.5–3.9), determined by EMP. Oxygen isotopes: (I. A. Franchi and R. C. Greenwood, OU) δ¹⁷O = 0.22, δ¹⁸O = 3.73, Δ¹⁷O = −1.72 (mean of 2, all ‰). Nitrogen isotopes: (I. A. Franchi and A. Verchovsky, OU) 89.8 ppm N with a bulk δ¹⁵N = 601 ‰ and a peak at 1000 °C of 1169‰.

Classification: Carbonaceous chondrite (CB); S3, moderate weathering. The meteorite is a Bencubbin-like carbonaceous chondrite (CB) based on petrography and metal/silicate ratio while O-isotopes suggest a close relation to CH chondrites.

Type specimen: A total of 20 g plus one polished thin section are at MNB. HSSH holds the main mass.

Data from:
  MB91
  Table 2
  Line 167:

Place of purchase:	Erfoud, Morocco
Date:	2005 Aug
Mass (g):	745.5
Pieces:	1
Class:	CB-like
Shock stage:	S3
Weathering grade:	moderate
Fayalite (mol%):	1.7-4.4
Ferrosilite (mol%):	1.5-3.9
Classifier:	A. Greshake, MNB
Type spec mass (g):	20
Type spec location:	MNB
Main mass:	HSSH

Plots:

O isotopes:

Institutions
and collections

MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
HSSH: Hanno Strufe, Langenbergstr. 32, 66954 Pirmasens, Germany; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)

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

Photos:

Credit	Photos
Photos from the Encyclopedia of Meteorites:
Hanno Strufe

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9933 approved meteorites from (Northwest Africa) (plus 1837 unapproved names)

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