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Northwest Africa 13571
Basic information Name: Northwest Africa 13571
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13571
Observed fall: No
Year found: 2013
Country: Morocco
Mass:help 61.1 g
Recommended:  Eucrite-melt breccia    [explanation]

This is 1 of 65 approved meteorites classified as Eucrite-melt breccia.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 5 Dec 2020
Writeup from MB 109:

Northwest Africa 13571 (NWA 13571)


Purchased: 2013

Classification: HED achondrite (Eucrite, melt breccia)

History: Sergey Vasiliev and Marc Jost (SJS) purchased the 61.1 g specimen from a Mohammed Sbai in Ouzarzazate, Morocco, in April 2013.

Physical characteristics: Sample is an ovoid-shaped fragment. The exterior is partially coated with a greenish-orange rind that may be where the impact melt vein is exposed on the surface. The cut face of the sample shows a dark interior with an impact melt brecciated structure.

Petrography: Sample shows breccia in breccia structure composed of angular to rounded clasts set within an opaque melt matrix. Clasts have brecciated textures composed of basaltic textured clasts set within a comminuted matrix crosscut by 2 mm thick opaque impact melt veins. Lithic fragments have subophitic textures with exsolved pyroxenes. Additional minerals are Si polymorph, chromite, ilmenite and apatite.

Geochemistry: (A. Love, App) low-Ca pyroxene, Fs61.5±0.6Wo2.7±0.8 (Mg#36.7±0.4, Fe/Mn=30.0±1.1, n=25); pigeonite, Fs55.9±4.1Wo11.0±3.4 (Fe/Mn=30.2±0.3, n=2); high-Ca pyroxene, Fs27.7±3.5Wo42.3±4.1 (Fe/Mn=30.2±0.8, n=17); plagioclase, An88.8±2.2Or0.4±0.2 (n=24).

Classification: HED achondrite (eucrite impact melt breccia). Based on textures and mineral compositions, sample is a basaltic eucrite impact melt breccia.

Specimens: Sergey Vasiliev and Marc Jost (SJS) hold the main mass. A type sample of composed of a slice and end cut weighing 12.23 g and a polished thin section are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Ouzarzazate, Morocco
Date:P 2013
Mass (g):61.1
Class:Eucrite-melt breccia
Shock stage:M-S5
Weathering grade:low
Ferrosilite (mol%):61.5±0.6; 55.9±4.1; 27.7±3.5
Wollastonite (mol%):2.7±0.8; 11.0±3.4; 42.3±4.1
Magnetic suscept.:2.77
Classifier:A. Love, App
Type spec mass (g):12.23
Type spec location:App
Main mass:Sergey Vasiliev and Marc Jost (SJS)
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)
SJS: Space Jewels Switzerland, 2555 Brügg, Switzerland (private address; updated 3 Jan 2010)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
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     This is 1 of 1903 approved meteorites from Morocco (plus 27 unapproved names) (plus 1 impact crater)

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