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Northwest Africa 11554 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 11554 This is an OFFICIAL meteorite name. Abbreviation: NWA 11554 Observed fall: No Year found: 2013 Country: Morocco Mass: 39 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 470 approved meteorites (plus 2 unapproved names) 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 |
Writeup from MB 106:
Northwest Africa 11554 (NWA 11554) Morocco 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: MB106 Table 0 Line 0: |
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Institutions 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) |
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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 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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