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Northwest Africa 12224 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12224 This is an OFFICIAL meteorite name. Abbreviation: NWA 12224 Observed fall: No Year found: 2006 Country: (Northwest Africa) Mass: 230 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 459 approved meteorites classified as Howardite. [show all] Search for other: Achondrites, HED achondrites, and Howardites | ||||||||||||||||||||||||||||||
Comments: | Approved 13 Nov 2018 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 107:
Northwest Africa 12224 (NWA 12224) (Northwest Africa) Purchased: 2006 Jun Classification: HED achondrite (Howardite) History: Purchased from a Moroccan dealer at the mineral show in Sainte-Marie-aux-Mines, France Petrography: (K. Metzler, IfP) Shock-compacted fine-grained breccia of dark gray appearance, criss-crossed by black shock melt veins up to several mm in width. It consists of gabbroic and basaltic (ophitic to subophitic) rock fragments and related debris. The majority of pyroxenes is free of exsolution lamellae, but exsolved pyroxenes also occur. Three grains of Fe-rich olivine have been found. This breccia contains devitrified melt droplets as well as clast-rich and clast-poor impact melt rocks. About 10-15% diogenitic components. Accessories are ilmenite, chromium spinel, troilite, silica polymorph, and Ni-poor metal (mostly oxidized). Geochemistry: Mineral compositions and geochemistry: Low-Ca pyroxene (n=19): Fs35.1±5.1Wo5.4±0.7 (Fs29.3-49.7Wo4.1-7.1); mean Fe/Mn (at.): 33. Ca-rich pyroxene (n=5) Fs49.3±2.8Wo16.8±3.6 (Fs45.4-53.0Wo13.1-20.5); mean Fe/Mn (at.): 31. Diogenitic pyroxene (n=3) Fs24.1Wo1.9 (Fs21.8-26.0Wo1.6-2.1) mean Fe/Mn (at.): 32. Olivine (n=3) Fa77.7 (Fa76.5-78.6); mean Fe/Mn (at.): 47. Plagioclase (n=9): An83.8±3.9 (An78.9-92.0). | ||||||||||||||||||||||||||||||
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) | ||||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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