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Northwest Africa 12340 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12340 This is an OFFICIAL meteorite name. Abbreviation: NWA 12340 Observed fall: No Year found: 2006 Country: (Northwest Africa) Mass: 74 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 12340 (NWA 12340) (Northwest Africa) Purchased: 2006 Jun Classification: HED achondrite (Eucrite, polymict) History: Purchased from a Moroccan mineral dealer at the meteorite show in Ensisheim, France Petrography: (K. Metzler, IfP) Polymict breccia consisting of eucritic lithic clasts with ophitic, subophitic and granulitic textures, and mineral fragments (eucritic and diogenitic pyroxene, plagioclase). Breccia-in breccia clasts and impact melt rock clasts are also present. These components are set in a fine-grained matrix of related debris, cemented by thin films of intergranular shock-melt. Most eucritic pyroxenes exhibit exsolution lamellae. Percentage of diogenitic components in the investigated sample is below 10 vol%. Accessories are silica polymorph, ilmenite, Cr-spinel, troilite, and metal. Secondary calcite occurs. Geochemistry: Mineral compositions and geochemistry: Eucritic low-Ca pyroxene: Fs45.6±10.1Wo4.7±1.6 (Fs32-61Wo3-8); mean Fe/Mn (at.): 32; n=15. Eucritic Ca-rich pyroxene: Fs27.3±6.3Wo40.1±2.8 (Fs15-35Wo36-44; n=8). Diogenitic pyroxene: Fs26.1±1.8Wo3.3±0.5 (Fs23-29Wo2-4); mean Fe/Mn (at.): 33; n=8. Plagioclase An91.1±0.7Or0.2±0.2 (An90-92Or0-0.5); n=13. | ||||||||||||||||||||||||||||
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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