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Northwest Africa 11548
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:help 402 g
Meteoritical Bulletin:  MB 106  (2018)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 605 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 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:
  Table 0
  Line 0:
Place of purchase:Denver
Date:P 2006
Mass (g):401.64
Weathering grade:minor
Ferrosilite (mol%):57.9±1.2, 33.2±4.5, 48.9±6.9
Wollastonite (mol%):4.3±0.9, 41.5±2.5, 15.7±8.6
Classifier:A. Ruzicka, K. Bocian, N. Mishra, Cascadia
Type spec mass (g):25.8
Type spec location:Cascadia
Main mass:Ronnie McKenzie
Comments:Lab number CML0680; submitted by A. Ruzicka
   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)
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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     This is 1 of 9776 approved meteorites from (Northwest Africa) (plus 1862 unapproved names)

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