Meteoritical Bulletin: Entry for Northwest Africa 6221

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Northwest Africa 6221

Basic information

Name: Northwest Africa 6221
This is an OFFICIAL meteorite name.
Abbreviation: NWA 6221
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass: 109.4 g

Classification
history:

Recommended:

Lunar (feldsp. breccia) [explanation]

This is 1 of 27 approved meteorites classified as Lunar (feldsp. breccia). [show all]
Search for other: Lunar meteorites

Comments:

Approved 19 Jan 2012

Writeup

Writeup from MB 100:

Northwest Africa 6221 (NWA 6221)

(Northwest Africa)

Purchased: Apr 2010

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by P. Thomas in April 2010 from a dealer who reported that this stone was found near Geltat Zemmour.

Physical characteristics: One single stone, dark gray with white clasts.

Petrography: (A. Jambon, O. Boudouma, D. Badia) Small mineral clasts in a fine-grained matrix with some heterogeneous glass (impact melt glass). Contains plagioclase, pigeonite, augite, ilmenite, olivine, merrilite. Rare lithic clasts.

Geochemistry: Feldspar An_96-89.Augite (Fs_27-22Wo_40-30, Fe/Mn=60). Olivine (Fa=12-29, Fe/Mn=60). Ilmenite with 6% MgO. Bulk composition (R. Korotev, WUSL): FeO 6.6 wt%, Sc 9.7 ppm, Ni 1120 ppm, Sm 5.7 ppm, Th 1.7 ppm.

Classification: Lunar (feldspathic breccia). Probably paired with NWA 4936 and NWA 5406.

Data from:
  MB100
  Table 0
  Line 0:

Origin or pseudonym:	Morocco or Western Sahara
Place of purchase:	Erfoud
Date:	P Apr 2010
Mass (g):	109.4
Pieces:	1
Class:	Lunar (feldsp. breccia)
Weathering grade:	minor
Fayalite (mol%):	12-29
Ferrosilite (mol%):	12-21
Wollastonite (mol%):	30-41
Magnetic suscept.:	3.81
Classifier:	A. Jambon, O. Boudouma, D. Badia
Type spec mass (g):	20
Type spec location:	UPVI
Main mass:	Meteoritica
Finder:	anonymous
Comments:	Submitted by A. Jambon

Institutions
and collections

UPVI: Université Pierre & Marie Curie (Paris VI), 4 Place Jussieu, 75005 Paris, France (institutional address)
WUSL: McDonnell Center for Space Sciences, Washington Univ., One Brookings Drive, St. Louis, MO 63130, USA (institutional address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 100, MAPS 46, in preparation (2013)

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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 3506 approved meteorites from (Northwest Africa) (plus 2663 unapproved names)

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