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Northwest Africa 12290 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 12290 This is an OFFICIAL meteorite name. Abbreviation: NWA 12290 Observed fall: No Year found: 2018 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 11 Dec 2018 | ||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 107:
Northwest Africa 12290 (NWA 12290) (Northwest Africa) Purchased: 2018 Classification: HED achondrite (Eucrite) History: The meteorite was purchased from a local meteorite dealer in Layaoune, Morocco. Physical characteristics: Brownish individual without fusion crust. Petrography: The meteorite is an unbrecciated medium-grained basalt predominantly composed of exsolved pyroxene and mostly lath-shaped calcic plagioclase with average grains sizes of about 400 μm. Minor phases include silica, ilmenite, chromite, troilite, barite, and zircon. No metallic iron has been detected. The meteorite is strongly shock metamorphosed and crosscut by several shock melt veins. All plagioclase has been transformed into maskelynite. Geochemistry: low-Ca pyroxene: Fs60.3±0.7Wo2.6±0.8 (Fs58.2-61.1Wo2.1-5.3, n=16, FeO/MnO=31-35); Ca-pyroxene: Fs26.3±1.0Wo42.9±1.3 (Fs25.2-29.4Wo39.1-44.1, n=14, FeO/MnO=28-37); calcic plagioclase: An89.3±1.0 (An88.1-90.7, n=14) | ||||||||||||||||||||||||||||
Data from: MB107 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. 107, MAPS 55, 460-462
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Geography: |
Statistics: This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names) |