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Northwest Africa 12221
Basic information Name: Northwest Africa 12221
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12221
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass:help 55 g
Meteoritical Bulletin:  MB 107  (2018)  CV3
Recommended:  CV3    [explanation]

This is 1 of 602 approved meteorites (plus 1 unapproved name) classified as CV3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites
Comments: Approved 12 Nov 2018
Writeup from MB 107:

Northwest Africa 12221 (NWA 12221)

(Northwest Africa)

Purchased: 2006 June

Classification: Carbonaceous chondrite (CV3)

History: Purchased from a Moroccan dealer at the meteorite show in Ensisheim, France

Petrography: (K. Metzler, IfP) Chondrules, CAIs and AOAs are embedded in a fine-grained dark matrix (about 40 vol% matrix). Most chondrules have apparent diameters between 0.2 and 1.0 mm, some up to 2.3 mm. Very few type II chondrules. Many chondrules with distinctive fine-grained rims; some chondrules with igneous rims. CAIs with sizes up to 2.3 mm have been observed.

Geochemistry: Mineral compositions and geochemistry: Random measurements of olivine grains revealed Fa5.7±3.0 (0.7-9.6); n=19. Random measurements of low-Ca pyroxene grains revealed Fs1.6±0.7Wo1.3±0.8 (Fs0.7-3.2Wo0.4-3.7); n=21.

Classification: CV chondrite based on CAI and AOA occurrence, size of chondrules and CAIs, chondrule-matrix ratio, and mineral chemistry. Petrologic type 3 based on the chemical variation of olivine and pyroxene.

Data from:
  Table 0
  Line 0:
Place of purchase:Ensisheim, France
Date:P 2006 June
Mass (g):55
Shock stage:S2
Weathering grade:moderate
Fayalite (mol%):5.7
Ferrosilite (mol%):1.6
Wollastonite (mol%):1.3
Classifier:K. Metzler, IfP
Type spec mass (g):11
Type spec location:IfP
Main mass:Anonymous
Comments:Submitted by K. Metzler, IfP
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 8890 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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