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Northwest Africa 8487
Basic information Name: Northwest Africa 8487
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8487
Observed fall: No
Year found: 2008
Country: (Northwest Africa)
Mass:help 550 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  LL3
Recommended:  LL3    [explanation]

This is 1 of 342 approved meteorites classified as LL3.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 29 Jul 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8487 (NWA 8487)

(Northwest Africa)

Purchased: 2008

Classification: Ordinary chondrite (LL3)

History: A stone weighing 550.1 g was purchased by Rob Wesel from a meteorite prospector.

Physical characteristics: Sample is irregularly shaped and devoid of fusion crust.

Petrography: Description and classification (A. Love, App): Sample is dark colored and displays numerous close-packed unequilibrated chondrules of varying size (avg. diameter 768 μm, range 213-3187 μm). Porphyritic chondrules show zoned phenocrysts and turbid mesostasis. Many chondrules display fine-grained rims composed of clastic and amorphous silicate and metal materials. Matrix occurs as a mixture of clastic and amorphous silicates and fine-grained metal.

Geochemistry: (A. Love, App) Fa13.0±6.8 (Fa2.1-23.2 n=15), Fe/Mn=35.9; Low Ca pyroxene Fs13.2±10.6Wo1.1±1.0, N=10.

Classification: Ordinary Chondrite, LL3 S3 W2. LL based on chondrule diameter. Porphyritic chondrules display mesostasis that is zoned, olivines with dull red CL and dull CL of matrix materials suggests sample is LL<3.5 (Huss et al., 2006). Turbid and devitrified mesostasis indicate petrologic grade of LL~3.4

Specimens: Rob Wesel holds the main mass. A 20 g type specimen and one polished thin section are on deposit at App

Bibliography:
  • Huss, G.R., Rubin, A.E. and Grossman, J.N. (2006) Thermal Metamorphism in Chondrites. in Meteorites and the Early Solar System II, D.S. Lauretta and H.Y. McSween Jr. (eds.), University of Arizona Press, Tucson, 943 pp., 567-586. (link)
Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2008
Mass (g):550.1
Pieces:1
Class:LL3
Shock stage:S3
Weathering grade:W2
Fayalite (mol%):13.0±6.8
Ferrosilite (mol%):13.2±10.6
Wollastonite (mol%):1.1±1.0
Classifier:A. Love, App
Type spec mass (g):20
Type spec location:App
Main mass:Rob Wesel
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7354 approved meteorites from (Northwest Africa) (plus 1958 unapproved names)

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