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Northwest Africa 8368
Basic information Name: Northwest Africa 8368
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8368
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 1994 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Mesosiderite
Recommended:  Mesosiderite    [explanation]

This is 1 of 217 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 6 Jun 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8368 (NWA 8368)

(Northwest Africa)

Purchased: 2014 Feb

Classification: Mesosiderite

History: Purchased by GHupé in February 2014 from a Moroccan dealer at the Tucson Gem and Mineral Show.

Physical characteristics: A large (1994 g) stone composed mainly of brown orthopyroxene and Fe-Ni metal with some scattered large (up to 3 cm), rounded metal-rich nodules and large (up to 1.3 cm), deep green, angular olivine clasts.

Petrography: (A. Irving and S. Kuehner, UWS) The main portion of the specimen consists of orthopyroxene, calcic plagioclase, minor clinopyroxene, merrillite, silica polymorph, troilite and metal (predominantly kamacite with rounded, amoeboid grains of taenite). Metal-rich nodules have a different texture and consist of kamacite, taenite and minor orthopyroxene exhibiting triple grain junctions among all phases.

Geochemistry: Orthopyroxene (Fs30.4-31.0Wo4.3-2.9, FeO/MnO =24-25), clinopyroxene (Fs13.8-16.3Wo41.4-38.4, FeO/MnO = 17-19), olivine (Fa33.6-33.7, FeO/MnO = 41-43).

Classification: Mesosiderite. The rounded geometry of grain boundaries for all mineral phases (except the large olivine clasts) is indicative of extensive recrystallization or annealing of an assemblage that originally was a fragmental breccia. The clasts of olivine cannot be in equilibrium with the silica-bearing main portion of the specimen, and must be derived from a separate lithology.

Specimens: A 27.7 g polished slice is at UWB. The remaining material is held by GHupé.

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2014 Feb
Mass (g):1994
Pieces:1
Class:Mesosiderite
Shock stage:low
Weathering grade:low
Fayalite (mol%):33.6-33.7
Ferrosilite (mol%):30.4-31.0; 13.8-16.3
Wollastonite (mol%):4.3-2.9; 41.4-38.4
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):27.7
Type spec location:UWB
Main mass:G. Hupe
Comments:GH-457; 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)
GHupé: Gregory M. Hupé, 9003 Placid Lakes Blvd., Lake Placid, FL 33852, United States; Website (private address)
Hupe: (old address—now see GHupé or AHupé) G. and A. Hupe, 2616 Lake Youngs Court SE, Renton, WA 98058., United States (private address)
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:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Anna Morris   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

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