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Northwest Africa 15658 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 15658 This is an OFFICIAL meteorite name. Abbreviation: NWA 15658 Observed fall: No Year found: 2022 Country: (Northwest Africa) Mass: 5.85 kg | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 102 approved meteorites classified as Eucrite-melt breccia. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 11 Feb 2023 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 112:
Northwest Africa 15658 (NWA 15658) (Northwest Africa) Purchased: October, 2022 Classification: HED achondrite (Eucrite, melt breccia) History: The meteorite was purchased from a meteorite dealer in Morocco. Physical characteristics: Dark grayish rock with some fusion crust. Petrography: Eucrite-melt breccia composed of up to 3 cm sized basaltic clasts and up to 500 µm sized mineral fragments in black shock melted matrix. Main minerals are exsolved pyroxenes and calcic plagioclase. The shock melt is mostly finely recrystallized and partly displays flow textures. Mineral grains entrained in the melt matrix often show resorption textures. Minor phases include silica, chromite, ilmenite, and FeS. No metallic iron detected. Geochemistry: low-Ca pyroxene: Fs62.5±0.6Wo2.6±0.8 (Fs61.3-63.6Wo1.9-4.6, FeO/MnO=27-30, n=10); high-Ca pyroxene: Fs27.6±0.7Wo43.6±0.7 (Fs26.3-28.7Wo42.2-44.9, FeO/MnO=27-32, n=10); calcic plagioclase: An87.1±1.0 (An85.4-88.9, n=10). | ||||||||||||||||||||||||||||
Data from: MB112 Table 0 Line 0: |
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Institutions and collections |
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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Geography: |
Statistics: This is 1 of 9627 approved meteorites from (Northwest Africa) (plus 1865 unapproved names) | ||||||||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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