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Northwest Africa 11591 | |||||||||||||||||||||
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Basic information | Name: Northwest Africa 11591 This is an OFFICIAL meteorite name. Abbreviation: NWA 11591 Observed fall: No Year found: 2016 Country: Algeria 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 9 Feb 2018 | ||||||||||||||||||||
Writeup![]() |
Writeup from MB 107:
Northwest Africa 11591 (NWA 11591) Algeria Purchased: 2016 May 1 Classification: HED achondrite (Eucrite) History: Purchased by Miao Bing-an in 2016 in Morocco. Physical characteristics: The fusion crust has been largely weathered from the surface of the sample. In the area where it remains, it is thin (<0. 5mm) and shiny black. The interior of the stone is medium gray and contains inclusions that range from whitish-gray to black. There are several clasts and small fractures in the stone. A small amount of oxidation is present in the interior of the sample. The sample is approximately 6.8 × 8.6 × 3.8 cm. Petrography (L.Huang, B. Miao, H. Chen, GUT): This meteorite is a pigeonite-plagioclase rock with fine to medium grain size. Breccia composed of mineral and lithic fragments set in a fine-grained, generally fragmental matrix. Lithic clasts are generally ophitic with medium-grained pyroxenes and skeletal plagioclase grains (width ~30-200 μm) and a fine-grained recrystallized mesostasis. Pyroxene generally contain pigeonite with augite lamellae (width ~3 μm). A silica phase is commonly present. Accessories are ilmenite, chromite, troilite and rare phosphate (apatite and merrillite. Geochemistry (L. Huang, B. Miao, H. Chen, GUT): Bulk pyroxene: Fe/Mn=30.2; Low-Ca pyroxene: median compositions are Mg#=36.5; Fs58.2Wo8.4 (n=30). augite lamellae: median compositions are Mg#=40.1, Fs43.9Wo26.7 (n=25). Plagioclase: An86.0Or0.7 to An92.4Or0.4. Classification: Basaltic polymict brecciated eucrite Specimens: 35.1 g and polished thin section are deposited in GUT | ||||||||||||||||||||
Data from: MB107 Table 0 Line 0: |
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Institutions and collections |
GUT: College of Earth Sciences, Guilin University of Technology, 12 Jiangan Road, Guilin 541004, China (institutional address; updated 18 Oct 2012) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Photos: |
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Geography:![]() |
Statistics: This is 1 of 1250 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters) |