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Northwest Africa 12218 | |||||||||||||||||||||||||||||||
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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: 27 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 643 approved meteorites (plus 1 unapproved name) 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 | ||||||||||||||||||||||||||||||
Writeup |
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: |
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Institutions and collections |
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Geography: |
Statistics: This is 1 of 9627 approved meteorites from (Northwest Africa) (plus 1865 unapproved names) | ||||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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