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Northwest Africa 8745 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 8745 This is an OFFICIAL meteorite name. Abbreviation: NWA 8745 Observed fall: No Year found: 2014 Country: (Northwest Africa) Mass: 5.22 kg | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 237 approved meteorites classified as Eucrite-br. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
Comments: | Approved 1 Mar 2017 | ||||||||||||||||||||||||||||
Writeup |
Writeup from MB 106:
Northwest Africa 8745 (NWA 8745) (Northwest Africa) Purchased: 2014 Jun Classification: HED achondrite (Eucrite, brecciated) History: Purchased by Darryl Pitt in June 2014 from a dealer in Mauritania. Physical characteristics: Single stone (5220 g) composed of pale clasts in a dark-brown matrix. Felsic lithic clasts exposed on the exterior have been eroded by desert ablation. Petrography: (A. Irving and S. Kuehner, UWS) Breccia composed of diabasic eucrite clasts in a matrix of related debris plus some subcalcic augite grains. Clasts consist predominantly of exsolved pigeonite (some of which appears red-brown in thin section) and calcic plagioclase (polycrystalline) with accessory silica polymorph, ilmenite and troilite. Calcite is present in small vugs and barite is a minor constituent. Geochemistry: Orthopyroxene host (Fs59.3-61.6Wo4.3-2.0, FeO/MnO = 32-33, N = 3), clinopyroxene exsolution lamellae (Fs25.8-26.6Wo44.2-43.6, FeO/MnO = 34-35, N = 3), subcalcic augite (Fs32.8Wo37.8, FeO/MnO = 32). Classification: Eucrite (breccia, diabasic, shocked). Specimens: 27.8 g including one polished thin section at UWB; the remainder is held by DPitt. | ||||||||||||||||||||||||||||
Data from: MB106 Table 0 Line 0: |
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Institutions and collections |
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012) UWB: University of Washington, Burke Museum of Natural History and Culture, Box 353010 Seattle, WA 98195, United States (institutional address; updated 9 Oct 2023) DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address) |
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Catalogs: |
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References: | Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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Geography: |
Statistics: This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names) | ||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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