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Northwest Africa 11591
Basic information Name: Northwest Africa 11591
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11591
Observed fall: No
Year found: 2016
Country: Algeria
Mass:help 1549 g
Meteoritical Bulletin:  MB 107  (2018)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 9 Feb 2018
Writeup from MB 107:

Northwest Africa 11591 (NWA 11591)


Purchased: 2016 May 1

Classification: HED achondrite (Eucrite)

History: Purchased by Miao Bing-an in 2016 in Morocco.

Physical characteristics: The fusion crust has been largely weathered from the surface of the sample. In the area where it remains, it is thin (<0. 5mm) and shiny black. The interior of the stone is medium gray and contains inclusions that range from whitish-gray to black. There are several clasts and small fractures in the stone. A small amount of oxidation is present in the interior of the sample. The sample is approximately 6.8 × 8.6 × 3.8 cm.

Petrography (L.Huang, B. Miao, H. Chen, GUT): This meteorite is a pigeonite-plagioclase rock with fine to medium grain size. Breccia composed of mineral and lithic fragments set in a fine-grained, generally fragmental matrix. Lithic clasts are generally ophitic with medium-grained pyroxenes and skeletal plagioclase grains (width ~30-200 μm) and a fine-grained recrystallized mesostasis. Pyroxene generally contain pigeonite with augite lamellae (width ~3 μm). A silica phase is commonly present. Accessories are ilmenite, chromite, troilite and rare phosphate (apatite and merrillite.

Geochemistry (L. Huang, B. Miao, H. Chen, GUT): Bulk pyroxene: Fe/Mn=30.2; Low-Ca pyroxene: median compositions are Mg#=36.5; Fs58.2Wo8.4 (n=30). augite lamellae: median compositions are Mg#=40.1, Fs43.9Wo26.7 (n=25). Plagioclase: An86.0Or0.7 to An92.4Or0.4.

Classification: Basaltic polymict brecciated eucrite

Specimens: 35.1 g and polished thin section are deposited in GUT

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2016 May 1
Mass (g):1549.00
Classifier:B. Miao, L.Huang, H. Chen, GUT
Type spec mass (g):35.1
Type spec location:GUT
Main mass:GUT
Comments:Submitted by Bingkui Miao
   and collections
GUT: College of Earth Sciences, Guilin University of Technology, 12 Jiangan Road, Guilin 541004, China (institutional address; updated 18 Oct 2012)
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Public domain photographs:
Zhipeng Xia   


     This is 1 of 1250 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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