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Northwest Africa 11516
Basic information Name: Northwest Africa 11516
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11516
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 1235 g
Classification
  history:
Meteoritical Bulletin:  MB 106  (2018)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 355 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 6 Dec 2017
Writeuphelp
Writeup from MB 106:

Northwest Africa 11516 (NWA 11516)

(Northwest Africa)

Purchased: 2016

Classification: HED achondrite (Eucrite, polymict)

History: Eight uncrusted stones weighing a total of 1234.65 g were found in Morocco prior to 2016. Blaine Reed acquired the samples from a meteorite dealer at the Denver Gem and Mineral Show in September of 2016.

Physical characteristics: Specimen is dark brownish-black-colored, irregularly shaped, pitted, lacks fusion and is weakly magnetic. Samples have a discontinuous coating of light orange caliche. Interior shows a brecciated texture and some flecks of Fe-metal are visible on the surface.

Petrography: Description and Classification (A. Love, App): Sample is a breccia composed of angular to subrounded clasts (up to 2 cm) of: vitrophyric basalt; ophitic basalt; cumulate (equilibrated cumulate); diogenite (<10 vol%), secondary breccias, rare glassy fragments and a shock melt clast. Many pyroxenes are exsolved, while one basaltic clast contains zoned pyroxenes. Eucrite clasts are dominant. Accessory minerals are: ilmenite, Si-polymorph, FeNi and Ni-free metal, chromite, FeS, fayalite, olivine, barite.

Geochemistry: (A. Love, App) Low-Ca pyroxene (Fs59.3-60.7 Wo2.0-5.4, FeO/MnO=28.7-29.3, N=2); pigeonite (Fs37.5-56.1 Wo6.6-19.3, FeO/MnO=26.0-29.5, N=6); high-Ca pyroxene (Fs29.1-34.6 Wo35.0-38.4, N=6); plagioclase (An86.2-95.4 Or0.0-0.5, N=11); diogenitic orthopyroxene (Fs23.6-35.9 Wo2.3-3.5, FeO/MnO=26.5-32.8, N=8); olivine (Fa 42.8-79.2, FeO/MnO=40.3-50.2, N=2).

Classification: HED (polymict eucrite breccia). Textures and mineral compositions suggest this is a polymict eucrite.

Specimens: Blaine Reed holds the main mass. A slice and an endcut weighing 38.62g and a polished mount and thin section are on deposit at App.

Data from:
  MB106
  Table 0
  Line 0:
Place of purchase:Denver Gem and Mineral Show
Date:P 2016
Mass (g):1234.6
Pieces:8
Class:Eucrite-pmict
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):42.8-79.2
Ferrosilite (mol%):60.2; 47.7±7.4; 32.0±1.9
Wollastonite (mol%):3.72; 11.0±5.0; 37.0±1.1
Classifier:A. Love, App
Type spec mass (g):38.6
Type spec location:App
Main mass:Blaine Reed
Finder:Anonymous
Comments:Submitted by Anthony Love
Institutions
   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)
Catalogs:
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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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7810 approved meteorites from (Northwest Africa) (plus 1971 unapproved names)

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