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Northwest Africa 13570
Basic information Name: Northwest Africa 13570
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13570
Observed fall: No
Year found: 2014
Country: Morocco
Mass:help 23.7 g
Classification
  history:
Recommended:  Eucrite-br    [explanation]

This is 1 of 190 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 12 Dec 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13570 (NWA 13570)

Morocco

Purchased: 2014

Classification: HED achondrite (Eucrite, brecciated)

History: Sergey Vasiliev and Marc Jost purchase the 23.7g specimen from a meteorite dealer while at the 2014 Ensisheim meteorite show.

Physical characteristics: Sample is an ovoid-shaped fragment with a glossy, black, flow-lined fusion crust coating ~ 60% of the specimen. Areas not coated with fusion crust are light orange in color. The cut face of the sample shows a light-colored granular breccia.

Petrography: Description and classification (A. Love, App) Sample is a cataclastic breccia composed of (vol%): 400-1700µm mineral and lithic fragments of exsolved pyroxene (50), plagioclase (49) and opaques. Lithic fragments have cumulate textures. Sample also contains pyroxene-rimmed silica objects. Additional minerals are silica polymorph, chromite, ilmenite and apatite.

Geochemistry: (A. Love, App) low-Ca pyroxene (Fs39.7±1.0Wo4.9±1.4, Mg#58.3±0.6, Fe/Mn=29.0±0.8, n=8); high-Ca pyroxene (Fs13.1±0.8Wo33.5±2.4, Fe/Mn=22.1±0.6, n=5) and plagioclase (An95.0±0.5Or0.1±0.0, n=8).

Classification: (HED achondrite) monomict eucrite breccia M-S2, low weathering. Based on textures and mineral compositions, sample is a brecciated cumulate eucrite.

Specimens: Sergey Vasiliev and Marc Jost (SJS) hold the main mass. A 4.8g slice and polished thin section are on deposit at App.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Ensisheim
Date:P 2014
Mass (g):23.7
Pieces:1
Class:Eucrite-br
Shock stage:M-S2
Weathering grade:low
Ferrosilite (mol%):39.7±1.0; 13.1±0.8
Wollastonite (mol%):4.9±1.4; 33.5±2.4
Magnetic suscept.:2.54
Classifier:A. Love, App
Type spec mass (g):4.8
Type spec location:App
Main mass:Sergey Vasiliev and Marc Jost (SJS)
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)
SJS: Space Jewels Switzerland, 2555 Brügg, Switzerland (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Sergey Vasilev   
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1670 approved meteorites from Morocco (plus 23 unapproved names) (plus 1 impact crater)

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