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Northwest Africa 12230 | |||||||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12230 This is an OFFICIAL meteorite name. Abbreviation: NWA 12230 Observed fall: No Year found: 2017 Country: (Northwest Africa) Mass: 1024 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 13 Nov 2018 | ||||||||||||||||||||||||||||||||||
Writeup |
Writeup from MB 107:
Northwest Africa 12230 (NWA 12230) (Northwest Africa) Purchased: 2017 Classification: HED achondrite (Eucrite, polymict) History: 34 identical stones with a total weight 1024.7 g were found by a meteorite prospector in Morocco. John Sinclair purchased the specimens at the 2017 Tucson Gem and Mineral Show. Physical characteristics: The stones have a dark-brownish-gray weathered exterior that has a granular texture and contains circular pits where clasts have been plucked out. The cut face of the interior is dark greenish-grey and shows a brecciated texture composed of lithic clasts and mineral fragments. Petrography: Description and classification (A. Love, App): Sample is a polymict breccia composed of rounded to irregular-shaped mineral clasts and sparse lithic clasts (up to 2 cm) from cumulate and vitrophyric eucrites, and diogenites (~6 vol%). Pyroxenes are exsolved. Accessory minerals are FeNi grains, silica polymorph, ilmenite, chromite and olivine. Geochemistry: (A. Love, App) Pigeonite host: Fs51.4±9.8Wo5.8±2.3 (Fs34.8-65.6Wo3.6-9.3, FeO/MnO=27.4-34.2), N=8; high-Ca pyroxene exsolution lamellae: Fs26.2±5.8Wo40.5±0.9 (Fs20.5-34.8Wo39.2-41.4), N=6; diogenitic orthopyroxene: Fs23.5±4.8Wo2.7±1.3 (Fs14.2-28.2Wo0.3-3.8, FeO/MnO=24.4-32.4), N=6; olivine (Fa43.5±6.5, FeO/MnO=50.0-65.3), N=3; plagioclase An92.0±2.1 (An88.5-94.3), N=10. Classification: Textural and compositional data (Fe/Mn of pyroxenes) indicate this is an HED achondrite. Sample contains 6% diogenite indicating this is a polymict eucrite breccia. The distinctive granular exterior and magnetic susceptibility suggest these stones are paired. Specimens: John Sinclair holds the remainder of this material. A polished thin section, epoxy mount and 2 slices weighing 41.5 g are on deposit at App. | ||||||||||||||||||||||||||||||||||
Data from: MB107 Table 0 Line 0: |
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Institutions and collections |
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013) |
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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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