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Northwest Africa 12218
Basic information Name: Northwest Africa 12218
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12218
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 27 g
Classification
  history:
Recommended:  CO3    [explanation]

This is 1 of 505 approved meteorites classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 12 Nov 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 12218 (NWA 12218)

(Northwest Africa)

Purchased: 2007 Jun

Classification: Carbonaceous chondrite (CO3)

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

Petrography: (K. Metzler, IfP) Chondrules, chondrule fragments, and CAIs are embedded in a fine-grained black matrix (about 20 vol% matrix). The vast majority of chondrules are type I chondrules. Apparent chondrule sizes mostly between 50 and 300 µm.

Geochemistry: Mineral compositions and geochemistry: Random measurements of olivine grains revealed Fa12.3±16.7 (2.7-77.5); n=25. Random measurements of low-Ca pyroxene grains revealed Fs2.7±2.4Wo1.7±0.9 (Fs1.1-11.9Wo0.8-4.6); n=25

Classification: CO chondrite based on CAI occurrence, small chondrule size, chondrule-matrix ratio, and mineral chemistry. Petrologic type 3 based on the chemical variation of olivine and pyroxene. Very low petrologic subtype (<3.5) based on the PMD of Fa values (136).

Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Ensisheim, France
Date:P 2007 Jun
Mass (g):27
Pieces:1
Class:CO3
Shock stage:S1
Weathering grade:Low
Fayalite (mol%):12.3±16.7
Ferrosilite (mol%):2.7±2.4
Wollastonite (mol%):1.7±0.9
Classifier:K. Metzler, IfP
Type spec mass (g):5.5
Type spec location:IfP
Main mass:Anonymous
Comments:Submitted by K. Metzler, IfP
Institutions
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6559 approved meteorites from (Northwest Africa) (plus 2021 unapproved names)

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