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Northwest Africa 11554
Basic information Name: Northwest Africa 11554
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11554
Observed fall: No
Year found: 2013
Country: Morocco
Mass:help 39 g
Meteoritical Bulletin:  MB 106  (2018)  CV3
Recommended:  CV3    [explanation]

This is 1 of 602 approved meteorites (plus 1 unapproved name) classified as CV3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites
Comments: Approved 29 Dec 2017
Writeup from MB 106:

Northwest Africa 11554 (NWA 11554)


Purchased: Sept 2013

Classification: Carbonaceous chondrite (CV3)

Physical characteristics: No fusion crust present. Reddish-brown dust covers surface of the sample. Millimeter-sized chondrules and CAIs visible from hand sample.

Petrography: Sample contains about 40% matrix, 50% Chondrules, and 10% CAIs. Matrix is mostly opaque and cryptocrystalline. <1% metal inclusions within the sample, mostly found in chondrules. Chondrules have an average diameter of 1 mm. Chondrules include plagioclase laths and interstitial plagioclase within porphyritic olivine or pyroxene chondrules.

Geochemistry: EMPA: Olivine is heterogeneous in the sample, with olivine in the matrix being more fayalitic (Fa45.8) than the chondrules (Fa15.8). Orthopyroxene was Mg2Si2O6 (enstatite) in composition, and clinopyroxene ranged from augite - diopside, with the average composition being augite. This sample includes relatively abundant >5% modal feldspar with a composition of An85.9±7.2, N = 16. Plagioclase within the CAIs is anorthitic, however the average composition is bytownite for the bulk rock.

Specimens: Type sample is housed at ROM as sample M57471

Data from:
  Table 0
  Line 0:
Place of purchase:Denver, Colorado, USA
Date:P Sept 2013
Mass (g):39
Shock stage:S1
Weathering grade:W3
Fayalite (mol%):23.5±19.7 (N = 35)
Ferrosilite (mol%):9.8±16.9 (N = 17)
Wollastonite (mol%):25.5±19.7 (N = 17)
Classifier:E. Lymer, YorkU
Type spec mass (g):8.2
Type spec location:ROM
Main mass:DGregory
Comments:Submitted by V. Di Cecco (ROM)
   and collections
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)
YorkU: Center for research in Earth and Space Science (CRESS) York University Toronto, ON, Canada (institutional address; updated 29 Dec 2017)
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 1932 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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