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| Northwest Africa 11548 | |||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 11548 This is an OFFICIAL meteorite name. Abbreviation: NWA 11548 Observed fall: No Year found: 2006 Country: (Northwest Africa) Mass:  402 g | ||||||||||||||||||||||||||
| Classification history: |
This is 1 of 616 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 11548 (NWA 11548) (Northwest Africa) Purchased: 2006 Classification: HED achondrite (Eucrite) History: A slice of an unclassified NWA specimen was donated to Cascadia by Mr. Fred Olsen in July, 2012 Physical characteristics: Exterior surfaces covered by weathering patina. Cut surfaces show minor weathering stains and brecciated texture with clasts up to 2.7 cm across. Petrography: Thin section shows a breccia with numerous lithic, mineral, impact melt, and melt breccia clasts dominated by pyroxene and plagioclase; clasts range in size from 1.2 cm to 50 microns or smaller. Original igneous textures are not easily discernible. Pyroxene grains often but not always show micron-scale exsolution lamellae. Calcite-filled fractures are present. Geochemistry: Low-Ca pyroxene Fs57.9±1.2Wo4.3±0.9 (N=25); augite Fs33.2±4.5Wo41.5±2.5 (N=21); bulk inverted pigeonite Fs48.9±6.9Wo15.7±8.6, taken as average of all pyroxene with Wo5.5-35 (N=66), plagioclase An86.5±4.9 Ab13.3±4.0 (N=66). Classification: Monomict, largely equilibrated, brecciated eucrite based on texture and mineral composition Specimens: Cascadia holds a 25.8 g slice, polished thin section, and potted butt all derived from slice RM#7. The main mass is held by Mr. Ronnie McKenzie | ||||||||||||||||||||||||||
| 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 9933 approved meteorites from (Northwest Africa) (plus 1837 unapproved names) | ||||||||||||||||||||||||||