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Northwest Africa 10674
Basic information Name: Northwest Africa 10674
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10674
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 1193 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 344 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 2 Jul 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 10674 (NWA 10674)

(Northwest Africa)

Purchased: 2015 Oct

Classification: HED achondrite (Eucrite, polymict)

History: Purchased by Marc Jost from a Moroccan dealer in Brügg, Switzerland, in October 2015.

Petrography: (A. Irving and S. Kuehner, UWS) Complex polymict breccia composed mainly of eucrite clasts and related debris, but with a significant component (20 vol.%) of dark, metal-bearing H6 chondrite clasts (up to 3 cm across) and sparse vitric breccia clasts, plus sparse (~2 vol.%) diogenite clasts, rare felsic anorthite-rich clasts (up to 1 cm across) and rare, small carbonaceous chondrite clasts (consisting of very small magnesian chondrules within a black matrix, reminiscent of CM2). The eucrite clasts have textures ranging from subophitic to microgabbroic to granulitic, and consist of exsolved pigeonite and calcic plagioclase with accessory silica polymorph, chromite, ilmenite, troilite and fayalite. The equilibrated H6 chondrite clasts contain rare chondrule remnants and relatively abundant stained metal. The vitric breccia clasts consist of angular grains of more magnesian orthopyroxene, magnesian olivine and stained kamacite within glass. One felsic clast (> 99 vol.% anorthite) contains accessory orthopyroxene, troilite and Ni-free metal.

Geochemistry: Orthopyroxene host (Fs61.4Wo2.6, FeO/MnO = 27), clinopyroxene exsolution lamellae (Fs25.9-26.8Wo40.2-42.8, FeO/MnO = 25-27, N = 2), plagioclase (An89.5-90.5Or0.3, N = 2), orthopyroxene in vitric clast (Fs15.2Wo1.1, FeO/MnO = 36), olivine in H6 chondrite clast (Fa18.6), olivine in vitric clast (Fa14.4-16.7, FeO/MnO = 31-38, N = 2), diogenitic orthopyroxene (Fs23.3-26.7Wo2.2-2.7, FeO/MnO = 26-27, N = 2), anorthite in felsic clast (An93.3Or0.3).

Classification: Eucrite (polymict breccia). The H6 chondrite clasts and vitric breccia clasts containing magnesian silicate minerals and kamacite are a very unusual feature of this specimen, although equilibrated H chondrite clasts are also present in howardite NWA 3197.

Specimens: 41.3 g including one polished thin section at UWB; remainder held by SJS.

Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:Brügg, Switzerland
Date:P 2015 Oct
Mass (g):1193
Pieces:4
Class:Eucrite-pmict
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):23.3-26.7; Fs61.4; 25.9-26.8
Wollastonite (mol%):2.2-2.7; 2.6; 40.2-42.8
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):41.3
Type spec location:UWB
Main mass:Space Jewels Switzerland
Comments:SJS 16001; 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)
SJS: Space Jewels Switzerland, 2555 Brügg, Switzerland (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7098 approved meteorites from (Northwest Africa) (plus 2005 unapproved names)

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