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Northwest Africa 11553
Basic information Name: Northwest Africa 11553
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11553
Observed fall: No
Year found: 2010
Country: Morocco
Mass:help 147.2 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  LL4
Recommended:  LL4    [explanation]

This is 1 of 368 approved meteorites classified as LL4.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 18 Dec 2017
Writeuphelp
Writeup from MB 106:

Northwest Africa 11553 (NWA 11553)

Morocco

Purchased: 2010 Feb

Classification: Ordinary chondrite (LL4)

Physical characteristics: Specimen has no visible fusion crust and has a brown-red oxidized outer appearance. Cut surface reveals gray to brown interior with visible chondrules and low abundance of metal. Chondrules are up to 5 mm in diameter.

Petrography: Chondrules show a large size variance, ranging from 200 µm to 5 mm, with a mean diameter of 764±412 µm (N=45). Chondrules are well defined in a dark devitrified matrix. Some FeNi metal shows signs of oxidation.

Geochemistry: Olivine Fa30.4 as determined by pXRD.

Classification: Chondrules are well defined.

Data from:
  MB106
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2010 Feb
Mass (g):147.21
Pieces:1
Class:LL4
Shock stage:S1
Weathering grade:W2
Fayalite (mol%):30.4±1
Classifier:J. Li, UTorG; V. Di Cecco, I. Nicklin, ROM
Type spec mass (g):20.51
Type spec location:ROM
Main mass:DGregory
Comments:Submitted by V. Di Cecco (ROM)
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)
UTorG: University of Toronto, Dept. Geology, Earth Sciences Centre, 22 Russell Street Toronto, Ontario, M5S 3B1, Canada (institutional address; updated 31 Jan 2011)
Catalogs:
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:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1488 approved meteorites from Morocco (plus 22 unapproved names) (plus 1 impact crater)

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