Meteoritical Bulletin: Entry for Northwest Africa 4049

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Northwest Africa 4049

Basic information

Name: Northwest Africa 4049
This is an OFFICIAL meteorite name.
Abbreviation: NWA 4049
Observed fall: No
Year found: 2003
Country: (Northwest Africa)
Mass: 1194 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	Mesosiderite-B2
Recommended:			Mesosiderite-B2 [explanation]

This is 1 of 10 approved meteorites classified as Mesosiderite-B2. [show all]
Search for other: Class B mesosiderites, Mesosiderites, and Metal-rich meteorites

Comments:

Approved 27 Jul 2013

Writeup

help

Writeup from MB 102:

Northwest Africa 4049 (NWA 4049)

(Northwest Africa)

Purchased: Oct 2003

Classification: Mesosiderite (group B2)

History: The sample was purchased in October, 2003, from a Moroccan trader by Mr. Thompson, and a portion was donated to Cascadia on April 6, 2005.

Physical characteristics: Large cut faces show ~40% metal, sometimes in subrounded to subangular clasts up to 7 mm across, and the presence of silicate clasts up to 1 cm across, with minor rustiness overall.

Petrography: (A. Ruzicka and K. Farley, Cascadia) Thin section examination reveals lightly deformed silicate mineral and lithic clasts composed chiefly of low-Ca pyroxene, high-Ca pyroxene, and plagioclase set in a granoblastic groundmass of the same minerals. Metal is minimally weathered (grade W1).

Geochemistry: (K. Farley and A. Ruzicka, Cascadia) Phase compositions are uniform for plagioclase (An_94.3±0.1Or_0.2±0.2, N=21), but more variable for low-Ca pyroxene (Wo_2.8±0.9Fs_29.9±4.1Fe/Mn =25.7±4.1, N=16) and high-Ca pyroxene (Wo_39.6±8.1Fs_16.1±3.7Fe/Mn = 17.8±2.5, N=10) (atomic units).

Classification: Stony-iron (mesosiderite). Textures and mineralogy suggest a group B mesosiderite of textural type 2.

Specimens: 55 g slice, 2 polished thin sections, and 2 butts at Cascadia. Thompson holds the main mass.

Data from:
  MB102
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P Oct 2003
Mass (g):	1194
Pieces:	1
Class:	Mesosiderite-B2
Shock stage:	low
Weathering grade:	W1
Ferrosilite (mol%):	29.9±4.1, 16.1±3.7
Wollastonite (mol%):	2.8±0.9, 39.6±8.1
Classifier:	A. Ruzicka, Cascadia
Type spec mass (g):	55
Type spec location:	Cascadia
Main mass:	Thompson
Comments:	Lab number CML0286.; submitted by A. Ruzicka

Institutions
and collections

Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address)

Catalogs:

References:

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

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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Jean-Michel Masson

Geography:

Coordinates:

Unknown.

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

Also see:

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Revision
history:

This lists important revisions made to data for this record.

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