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Northwest Africa 13649 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 13649 This is an OFFICIAL meteorite name. Abbreviation: NWA 13649 Observed fall: No Year found: 2020 Country: (Northwest Africa) Mass: 164 g | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 459 approved meteorites classified as Howardite. [show all] Search for other: Achondrites, HED achondrites, and Howardites | ||||||||||||||||||||||||||||
Comments: | Approved 16 Jan 2021 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 110:
Northwest Africa 13649 (NWA 13649) (Northwest Africa) Purchased: 2020 Oct Classification: HED achondrite (Howardite) History: The meteorite was purchased from a dealer in Tindouf, Algeria. Physical characteristics: Dark brownish rock without fusion crust. Exposes fresh dark grayish interior. Petrography: The meteorite is a polymict fragmental breccia composed of a large varitey of mineral and few up to 2 mm sized coarse-grained basaltic clasts set into a fine-grained clastic groundmass. Predominant minerals are diogenetic low-Ca pyroxene (about 40 vol%), more Fe-rich low-Ca pyroxene, Fe-rich low-Ca pyroxenes with augite exsolution lamellae, magmatically zoned low-Ca pyroxene, and calcic plagioclase all with highly variable grain sizes. Diogenetic low-Ca pyroxenes are up to 1 mm in size. Minor phases include silica, chromite, ilmenite, FeS, and metallic iron. The meteorite is highly shocked and contains shock melt veins; plagioclase is completely converted into maskelynite. Geochemistry: eucritic low-Ca pyroxene: Fs62.8±1.1Wo2.6±0.4 (Fs60.8-63.9Wo2.2-3.7, n=13, FeO/MnO=28-31); augite exsolution lamellae: Fs27.8±0.6Wo41.6±0.5 (Fs26.7-28.7Wo40.7-42.4, n=13, FeO/MnO=24-31); low-Ca-pyroxene: Fs39.2±0.2Wo2.6±0.1 (Fs39.0-39.5Wo2.4-2.7, n=7, FeO/MnO=25-28); zoned low-Ca-pyroxene: Fs26.2±4.6Wo2.7±0.1 (Fs22.0-34.2Wo2.4-2.9, n=10, FeO/MnO=26-32); diogenetic low-Ca pyroxene: Fs29.9±0.2Wo3.0±0.1 (Fs29.4-30.1Wo2.9-3.1, n=7, FeO/MnO=25-27); calcic plagioclase: An86.6±4.9 (An80.9-92.8, n=12) | ||||||||||||||||||||||||||||
Data from: MB110 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 Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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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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