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Northwest Africa 4890 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 4890 This is an OFFICIAL meteorite name. Abbreviation: NWA 4890 Observed fall: No Year found: 2006 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 12 Mar 2019 | ||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 108:
Northwest Africa 4890 (NWA 4890) (Northwest Africa) Purchased: 2006 Classification: HED achondrite (Eucrite) History: The meteorite was purchased in 2006 from a local meteorite dealer in Rissani, Morocco. Physical characteristics: Grayish fragment partly covered with fusion crust. Petrography: The meteorite is an unbrecciated basalt predominantly composed of exsolved pyroxenes and calcic plagioclase with highly variable grain sizes ranging from 50 µm to 1.5 mm. Minor phases are silica, chromite, FeS, ilmenite, and metallic Fe. Geochemistry: low-Ca pyroxene: Fs57.1±2.8Wo7.3±3.3 (Fs51.1-60.2Wo3.9-14.6, n=11, FeO/MnO=29-32); Ca-pyroxene: Fs32.0±3.9Wo38.4±4.9 (Fs30.0-44.4Wo23.1-41.1, n=12, FeO/MnO=29-32); calcic plagioclase: An88.8±0.6 (An88.2-90.3, n=11) | ||||||||||||||||||||||||||||
Data from: MB108 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) Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Geography: |
Statistics: This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names) |