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Northwest Africa 12221 | |||||||||||||||||||||||||||||||
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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: 55 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 628 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 |
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: 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 9589 approved meteorites from (Northwest Africa) (plus 1869 unapproved names) | ||||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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