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Northwest Africa 11531
Basic information Name: Northwest Africa 11531
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11531
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 35.5 g
Meteoritical Bulletin:  MB 106  (2018)  Diogenite
Recommended:  Diogenite    [explanation]

This is 1 of 481 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 18 Dec 2017
Writeup from MB 106:

Northwest Africa 11531 (NWA 11531)

(Northwest Africa)

Purchased: 2016

Classification: HED achondrite (Diogenite)

History: A single stone weighing 35.2 g was found in Morocco prior to 2016. J. Donald Cline and John Sinclair acquired the sample from a meteorite dealer at the Tucson Gem and Mineral Show in February of 2017.

Physical characteristics: Sample is mottled dark-greenish-gray colored, non-magnetic and tabular in shape. Sample has an obvious brecciated texture composed of light-colored clasts in a darker groundmass. One side of sample has an orange coating and is notably more flattened than the opposite side which is quite irregular.

Petrography: Description and classification (A. Love, App): Sample is a breccia composed of dominant sub-rounded to angular fragments of orthopyroxene (up to 1650 µm, average length 880 µm), olivine (~2 vol%), plagioclase, glass, chromite, FeS, FeNi, minor phosphate and Si-polymorph metal set in matrix of similar finer-grained Opx, olivine and interstitial plagioclase. Some Opx grains contain olivine melt inclusions. Sample is transected by networks of opaque shock veins.

Geochemistry: (A. Love, App) Low Ca-Opx (Fs21.4±0.7Wo2.5±0.4, FeO/MnO=26.3-28.4, N=18), Olivine (Fa22.8±0.4, FeO/MnO=46.8-49.3, N=8), plagioclase An85.7±1.3Or0.2±0.0, N=5).

Classification: HED (diogenite).

Specimens: PARI holds the main mass. A slice and several small fragments weighing 7.1 g and a polished thin section are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson Gem and Mineral Show
Date:P 2016
Mass (g):35.5
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):22.8±0.4
Ferrosilite (mol%):21.4±0.7
Wollastonite (mol%):2.5±0.4
Classifier:A. Love, App
Type spec mass (g):7.1
Type spec location:App
Main mass:PARI
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)
PARI: Pisgah Astronomical Research Institute 1 Pari Dr Rosman, NC 28772, United States (institutional address; updated 13 Sep 2016)
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 8025 approved meteorites from (Northwest Africa) (plus 1951 unapproved names)

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