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Northwest Africa 11117
Basic information Name: Northwest Africa 11117
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11117
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 68 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  L3
Recommended:  L3    [explanation]

This is 1 of 705 approved meteorites classified as L3.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 7 Feb 2017
Writeuphelp
Writeup from MB 106:

Northwest Africa 11117 (NWA 11117)

Northwest Africa

Purchased: 2016

Classification: Ordinary chondrite (L3)

History: One partially crusted stone weighing 68 g was purchased by Thomas Webb from a prospector in Morocco in January 2016.

Physical characteristics: The oriented sample is irregularly shaped and contains minor amounts of weathered fusion crust. There are a few cracks in the fusion crust that expose light-colored chondrules surrounded by a dark-colored matrix.

Petrography: Description and classification (A. Love, App): Sample is dark-colored and displays numerous close-packed unequilibrated chondrules of varying size (avg. dia. 433 μm (78-1361 μm), n=74). Porphyritic chondrules display well-developed zoning. Chondrule mesostasis is turbid and isotropic glass is common. Some chondrules contain relict grains. Many chondrules display fine-grained rims composed of clastic and amorphous silicate and metal materials. Some fine-grained chondrule rims contain porphyritic-textured microchondrules (diameters as small as 50 μm) occurring within clastic material.

Geochemistry: Olivine: Fa13.2±7.6 (Fa1.1-29.3) N=34, Fe/Mn=47.1±16, ferroan olivine - Fa17.5±4.8, Cr2O3 in ferroan olivines is 0.5±0.1 wt% (0.3-0.8) n=17; low Ca-pyroxene: Fs19.0±12.1Wo1.6±1.3 (Fs2.4-44.9, N=20).

Classification: Ordinary Chondrite (L3) S2 W1. Based on Fe/Mn=47 in olivines, sample is an L chondrite. Based on Fa values and range of Cr2O3 contents within ferroan olivines, the sample is L≥3.00 (Grossman and Brearley, 2005). Abundant porphyritic chondrules display yellow CL, olivines with bright red CL and red CL of matrix materials suggests sample is L<3.1, (Huss et al., 2006). Common isotropic glass in mesostasis is indicate petrologic grade of L<3.3.

Specimens: Webb holds the main mass. Two slices weighing 12.74 g and a polished thin section are on deposit at App.

Bibliography:
  • Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)
Data from:
  MB106
  Table 0
  Line 0:
Date:P 2016
Mass (g):68
Pieces:1
Class:L3
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):13.2±7.6 (N=34)
Ferrosilite (mol%):19.0±12.1 (N=20)
Wollastonite (mol%):1.6±1.3
Classifier:A. Love, App
Type spec mass (g):13.7
Type spec location:App
Main mass:TWebb
Finder:Anonymous
Comments:Submitted by Anthony Love
Institutions
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
TWebb: No contact information provided., United States (private address)
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.
Find references in NASA ADS:
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7320 approved meteorites from (Northwest Africa) (plus 1973 unapproved names)

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