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| Northwest Africa 11549 | |||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 11549 This is an OFFICIAL meteorite name. Abbreviation: NWA 11549 Observed fall: No Year found: 2013 Country: (Northwest Africa) Mass:  24.6 g | ||||||||||||||||||||||||||
| Classification history: |
This is 1 of 598 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||
| Comments: | Approved 29 Dec 2017 | ||||||||||||||||||||||||||
| Writeup |
Writeup from MB 106:
Northwest Africa 11549 (NWA 11549) (Northwest Africa) Purchased: 2013 Classification: HED achondrite (Eucrite) History: Donated to Cascadia by Mr. John A. Shea, who purchased the sample in 2013 from Mr. Steve Witt who in turn had acquired the specimen in a lot of NWA meteorites from an unknown trader. Physical characteristics: Remnant fusion crust and broken surfaces with light orange weathering patina visible on two pieces. Cut surfaces reveal light-gray interior with minimal weathering staining, including coarser portions and finer portions. Coarser areas are dominated by grey pyroxene and lighter colored plagioclase up to ~1 mm across Petrography: Contains clasts rich in plagioclase and pyroxene with textures that range from ophitic to subpohitic to granular. Pyroxene grains sometimes show micron-scale exsolution lamellae. Minor weathering product. Geochemistry: Bulk pigeonite Fs55.1±5.8Wo12.0±6.7, taken as average of all pyroxene with Wo5.5-35 (N=150), low-Ca pyroxene in fusion crust Fs48.4±3.0Wo4.3±0.6 (N=4); augite Fs37.1Wo35.3 (N=1); plagioclase An85.2±2.3Ab14.4±2.0 (N=91). Fusion crust glass (average of 14 analyses, wt. %): SiO2 47.4±0.6, TiO2 1.0±0.2, Al2O3 11.0±0.3, Cr2O3 0.25, FeO 20.6±0.4, MnO 0.69±0.1, MgO 6.8±0.1, CaO 9.9±0.4, Na2O 0.53±0.04, total 98.1±0.7. Classification: Monomict eucrite based on texture and mineral composition. Composition of fusion crust glass, proxy for bulk rock composition, is similar to non-cumulate eucrites such as Juvinas Specimens: Cascadia holds 2 pieces (5.7 g, 1.7 g), a polished thin section, and a potted butt. Mr. John A. Shea (201 East Rose Valley Rd, Wallingford PA, 19086) holds the main mass | ||||||||||||||||||||||||||
| Data from: MB106 Table 0 Line 0: |
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| Institutions and collections |
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011) |
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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) | ||||||||||||||||||||||||||
| Also see: |
This lists the most popular meteorites among people who looked up this meteorite.
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| Revision history: |
This lists important revisions made to data for this record.
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