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Northwest Africa 12222 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12222 This is an OFFICIAL meteorite name. Abbreviation: NWA 12222 Observed fall: No Year found: 2018 Country: (Northwest Africa) Mass: 1.9 g | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 18 approved meteorites classified as Martian (polymict breccia). [show all] Search for other: Martian meteorites | ||||||||||||||||||||||||||||
Comments: |
Approved 12 Nov 2018 Revised 16 Nov 2018: Updated class; see NWA 7034) | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 107:
Northwest Africa 12222 (NWA 12222) (Northwest Africa) Purchased: 2018 Mar Classification: Martian meteorite (polymict breccia) Petrography: (K. Metzler, IfP) Achondritic breccia, consisting of lithic and mineral clasts, set in a fine-grained clastic matrix. The following minerals were identified: Plagioclase, pyroxene (occasionally with exsolution lamellae), Cl-bearing apatite, ilmenite, and pyrrhotite. Beside complex fine-grained lithologies two different basalt clasts were found. Geochemistry: Mineral compositions and geochemistry: Basalt clast #1: Pyroxene (n=5) Fs37.6±0.2Wo35.7±0.4 (Fs37.3-37.8Wo35.2-36.1); mean Fe/Mn (at.)=36. Plagioclase (n=6): An55.2±3.5Or1.9±0.3 (An50.2-59.3Or1.3-2.2). Basalt clast #2: Pyroxene (n=7) Fs33.5±3.1 Wo4.0±0.9 (Fs25.6-34.6Wo1.6-4.6); mean Fe/Mn (at.)=38. Plagioclase (n=7): An53.5±4.2Or1.9±0.4 (An49.5-60.9Or1.4-2.7). Classification: Martian (polymict breccia), based on texture and mineral composition. An values in Feldspar and Fe/Mn in pyroxene are typical of Martian basalts. This sample is most probably paired to NWA 7034 and pairings. | ||||||||||||||||||||||||||||
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: |
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