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Northwest Africa 11573
Basic information Name: Northwest Africa 11573
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11573
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 107 g
Meteoritical Bulletin:  MB 107  (2018)  Aubrite
Recommended:  Aubrite    [explanation]

This is 1 of 78 approved meteorites classified as Aubrite.   [show all]
Search for other: Achondrites, Aubrites, Enstatite achondrites, and Enstatite-rich meteorites
Comments: Approved 16 Jan 2018
Writeup from MB 107:

Northwest Africa 11573 (NWA 11573)

(Northwest Africa)

Purchased: 2017

Classification: Enstatite achondrite (Aubrite)

History: Three uncrusted stones weighing a total of 107 g were found in Morocco prior to 2016. J. Donald Cline and John Sinclair acquired the samples from a meteorite dealer at the Tucson Gem and Mineral Show in February of 2017.

Physical characteristics: Specimen is dark orange-brown-colored, has a pitted irregular-shape and lacks fusion crust. Interior shows a brecciated texture composed of light orange-brown crystals, lithic fragments and metallic grains are visible on the cut surface.

Petrography: Description and Classification (A. Love, App): Sample is a breccia composed of angular to subrounded crystals of enstatite (up to 5 mm) and cumulate-textured clasts. Clasts show poikolitic texture composed of subhedral to anhedral, polysynthetically twinned enstatite and anhedral plagioclase feldspar set within birefringent, nonstoichiometric albitic glass. Additional minerals are; daubréelite; Si-polymorph; schreibersite; Si-bearing (4.88 wt%) kamacite; perryite; graphite; niningerite; troilite and oldhamite.

Geochemistry: (A. Love, App) Enstatite (Fs0.2±0.2Wo0.4±0.1, N=18); plagioclase (An2.4±0.5Or5.0±0.4, N=11).

Classification: Achondrite (aubrite). Textures, mineralogy and mineral compositions suggest this is a aubrite.

Specimens: PARI holds the main mass. A whole individual and an endcut weighing 20.6 g, a polished mount and thin section are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson Gem and Mineral Show
Date:P 2017
Mass (g):107
Shock stage:low
Weathering grade:moderate
Ferrosilite (mol%):0.2±0.2
Wollastonite (mol%):0.4±0.1
Classifier:A. Love, App
Type spec mass (g):20.6
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 Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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     This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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