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Northwest Africa 7827
Basic information Name: Northwest Africa 7827
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7827
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 468 g
Classification
  history:
Meteoritical Bulletin:  MB 102  (2013)  L4
Recommended:  L4    [explanation]

This is 1 of 1728 approved meteorites (plus 4 unapproved names) classified as L4.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 28 Jun 2013
Writeuphelp
Writeup from MB 102:

Northwest Africa 7827 (NWA 7827)

(Northwest Africa)

Purchased: 2013 Jan

Classification: Ordinary chondrite (L4)

History: Purchased by Matthew Martin in January 2013 from a Moroccan dealer at the Tucson Gem and Mineral Show.

Physical characteristics: A single stone (467.6 g) coated by extremely fresh, black fusion crust. The gray interior is crosscut by thin black, glassy veinlets.

Petrography: (A. Irving and S. Kuehner, UWS) Very fresh equilibrated chondrite composed of mostly well-formed, chondrules in a fine- grained matrix; however, some chondrules are only partial spheres and appear to have been sheared. Minerals are olivine, orthopyroxene, subcalcic augite, augite, sodic plagioclase, chromite, kamacite and troilite.

Geochemistry: Olivine (Fa24.7-24.8), orthopyroxene (Fs21.4-21.5Wo1.6), subcalcic augite (Fs12.8Wo29.7), augite (Fs8.1Wo45.3).

Classification: Ordinary chondrite (L4). The interior glassy veinlets are indicative of moderate shock.

Specimens: A total of 20.2 g of material and one polished thin section are on deposit at UWB. MMartin holds the main mass.

Data from:
  MB102
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2013 Jan
Mass (g):467.6
Pieces:1
Class:L4
Shock stage:S3
Weathering grade:W0
Fayalite (mol%):24.7-24.8
Ferrosilite (mol%):21.4-21.5
Wollastonite (mol%):1.6
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.2
Type spec location:UWB
Main mass:MMartin
Comments:MM13-1; submitted by A. Irving
Institutions
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
MMartin: P.O. Box 164, Kaaawa, HI 96730, United States; Website (private address; updated 14 Jul 2013)
Catalogs:
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7912 approved meteorites from (Northwest Africa) (plus 1974 unapproved names)

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