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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:help 109.4 g
Meteoritical Bulletin:  MB 100  (2012)  Lunar (feldsp. breccia)¬†
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 291 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 19 Jan 2012
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 An96-89. Augite (Fs27-22Wo40-30, 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:
  Table 1
  Line 1311:
Origin or pseudonym:Morocco or Western Sahara
Place of purchase:Erfoud
Date:P Apr 2010
Mass (g):109.4
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
Comments:Submitted by A. Jambon
   and collections
UPVI: Université Pierre et Marie Curie (Paris VI),Case 110, 4 Place Jussieu, 75005 Paris, France (institutional address; updated 5 Oct 2014)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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