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Northwest Africa 10128
Basic information Name: Northwest Africa 10128
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10128
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 1804 g
Meteoritical Bulletin:  MB 104  (2015)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 393 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 23 May 2015
Writeup from MB 104:

Northwest Africa 10128 (NWA 10128)

(Northwest Africa)

Purchased: 2015 Jan

Classification: HED achondrite (Eucrite, polymict)

History: Purchased by Darryl Pitt in January 2015 from a dealer in Erfoud, Morocco.

Petrography: (A. Irving and S. Kuehner, UWS) Fragmental breccia composed of sparse gabbroic eucrite clasts plus abundant related crystalline debris and a few percent large (up to 3.8 mm) diogenitic orthopyroxene grains set within a fine grained matrix. Other minerals include calcic plagioclase (polycrystalline), orange-stained pyroxenes (pigeonite, subcalcic augite, augite), silica polymorph, olivine (with at least two different compositions), ilmenite, chromite, troilite and minor barite. Diogenitic orthopyroxene exhibits undulose extinction, and is variable in composition.

Geochemistry: Olivine (Fa28.3, FeO/MnO = 55; Fa43.8, FeO/MnO = 48), diogenitic orthopyroxene (Fs19.3Wo1.2, FeO/MnO = 29; Fs30.2Wo2.2, FeO/MnO = 32), pigeonite (Fs44.3Wo12.1, FeO/MnO = 32; Fs52.1Wo7.2, FeO/MnO = 33), subcalcic augite (Fs23.3Wo33.2, FeO/MnO = 25), augite (Fs37.2Wo41.4, FeO/MnO = 33).

Classification: Eucrite (polymict breccia).

Specimens: 20.1 g including one polished thin section at UWB. The remainder is held by DPitt.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2015 Jan
Mass (g):1804
Shock stage:moderate
Weathering grade:moderate
Fayalite (mol%):28.3; 43.8
Ferrosilite (mol%):19.3; 30.2; 52.1; 44.3; 23.3;37.2
Wollastonite (mol%):1.2; 2.2; 7.2; 12.1; 33.2; 41.4
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20.1
Type spec location:UWB
Main mass:DPitt
Comments:MAC 103; submitted by A. Irving
   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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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     This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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