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Northwest Africa 11396
Basic information Name: Northwest Africa 11396
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11396
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 953 g
Meteoritical Bulletin:  MB 106  (2018)  Eucrite-melt breccia
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 57 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 6 Aug 2017
Writeup from MB 106:

Northwest Africa 11396 (NWA 11396)

(Northwest Africa)

Purchased: 2017

Classification: HED achondrite (Eucrite, melt breccia)

History: One stone weighing 953 g was found by a meteorite prospector in Morocco. Blaine Reed purchased the specimen at the 2017 Tucson Gem and Mineral Show.

Physical characteristics: The stone is dark-brownish-gray in color, has a flattened ovoid shape, lacks fusion crust and has a weathered exterior. The cut face of the interior is dark greenish-gray and shows a brecciated texture composed of lithic clasts and mineral fragments.

Petrography: Description and classification (A. Love, App): Sample is a polymict breccia composed of two lithologies: a lighter-colored breccia composed of rounded to irregularly shaped, up to 5 mm, cumulate clasts and related mineral debris sintered together and a markedly darker colored lithology composed of similar cumulate clasts contained within a finer-grained melt matrix composed of sulfide and plagioclase laths. Rare pyroxene grains show exsolution lamellae but, most appear to have been recrystallized into fine-grained mosaics. Rare plagioclase crystals show equilibrium textures with 120º grain boundaries. Clasts show albite twinning in plagioclase. One clast is an impact melt composed of larger pyroxenes set within vesicular melt matrix of fine plagioclase laths and sulfides. Pyroxenes are cross-cut by darker regions that may be relict shock veins form another event. Accessory minerals are Si-rich polymorph, ilmenite, chromite and rare zircon.

Geochemistry: (A. Love, App) Pigeonite host Fs55.91±1.43Wo7.72±0.92 (Fs54.79-57.72Wo6.31-9.26, FeO/MnO=27.40-34.23, N=9); high-Ca pyroxene exsolution lamellae Fs26.83±0.24Wo43.49±0.37 (Fs26.51-27.12Wo42.97-43.99, N=4); plagioclase An89.20±1.63 (An86.35-91.21, N=8).

Classification: Textural and compositional data indicate this is an HED Achondrite (equilibrated polymict eucrite melt breccia).

Specimens: Blaine Reed holds the main mass. A polished thin section, epoxy mount and 2 slices weighing 36.01g are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2017
Mass (g):953
Class:Eucrite-melt breccia
Shock stage:moderate
Weathering grade:low
Ferrosilite (mol%):54.79-54.72; 26.51-27.12
Wollastonite (mol%):6.31-9.26; 42.97-43.99
Classifier:A. Love, App
Type spec mass (g):36.01
Type spec location:App
Main mass:Blaine Reed
Comments:Submitted by Anthony Love
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address)
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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     This is 1 of 8138 approved meteorites from (Northwest Africa) (plus 1941 unapproved names)

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