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Northwest Africa 12344 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12344 This is an OFFICIAL meteorite name. Abbreviation: NWA 12344 Observed fall: No Year found: 2018 Country: (Northwest Africa) Mass: 456 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 406 approved meteorites classified as Eucrite-pmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 14 Dec 2018 | ||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 107:
Northwest Africa 12344 (NWA 12344) (Northwest Africa) Purchased: 2018 Jan Classification: HED achondrite (Eucrite, polymict) Petrography: (K. Metzler, IfP) Polymict breccia consisting of eucritic lithic clasts with ophitic textures and mineral fragments (pyroxene, plagioclase, silica polymorph) set in a fine-grained matrix of related debris. The matrix is clastic, bound by intergranular shock-melt, and intermingled with vesicular melt pockets (up to 5 mm). The latter show quench tetxtures, consisting of parallel aligned pyroxene and plagioclase skeletal crystals. Both pyroxenes with and without exsolution lamellae occur. Iron-rich olivine was found as isolated fragments and in the shape of veins in lithic clasts. Accessories are silica polymorph, ilmenite, Cr-spinel, troilite, and Ni-poor metal. Geochemistry: Mineral compositions and geochemistry: Low-Ca pyroxene: Fs64.5±4.4Wo2.4±0.7 (Fs55.8-68.4Wo1.9-4.7); mean Fe/Mn (at.): 29.8; n=13. Ca-rich pyroxene: Fs30.8±1.0Wo42.5±0.6 (Fs28.4-32.2Wo41.6-43.4) n=12. Olivine: Fa75.0 (Fa74.6-75.7); mean Fe/Mn (at.): 44.1; n=3. Plagioclase An90.6±2.5Or0.3±0.3 (An86.9-94.0Or0.0-0.8); n=8. | ||||||||||||||||||||||||||||||
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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