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Northwest Africa 13523
Basic information Name: Northwest Africa 13523
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13523
Observed fall: No
Year found: 2019
Country: Algeria
Mass:help 255 g
Classification
  history:
Recommended:  Eucrite-br    [explanation]

This is 1 of 225 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 19 Nov 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13523 (NWA 13523)

Algeria

Find: 2019

Classification: HED achondrite (Eucrite, brecciated)

History: Purchased in 2020 by Matthew Stream from a seller in Algeria.

Physical characteristics: Single stone with minor fusion crust.

Petrography: (D. Sheikh, FSU) Sample is a brecciated eucrite composed of cumulate eucrite clasts, basaltic eucrite clasts, anorthositic clasts, and isolated mineral fragments set in a fine-grained matrix. Accessory phases include chromite (some Ti-rich), troilite, SiO2-rich glass, and ilmenite.

Geochemistry: Low-Ca Pyroxene (Fs41.1±2.9 Wo2.2±1.0, range Fs31.6-45.2 Wo1.0-4.1, FeO/MnO = 31±4, n=47), Pigeonite (Fs38.3±2.8Wo10.4±3.5, range Fs34.5-42.1Wo6.5-17.4, FeO/MnO = 30±3, n=9), Augite (Fs20.7±2.7Wo41.2±0.1, range Fs18.7-22.6Wo41.1-41.3, FeO/MnO = 26±3, n=2), Calcic Plagioclase (An88.0±4.9, range An80.1-96.3, n=18).

Classification: HED Achondrite (Eucrite, brecciated)

Specimens: 20.77 grams at UCLA; main mass with Matthew Stream.

Data from:
  MB109
  Table 0
  Line 0:
Date:2019
Mass (g):255
Pieces:1
Class:Eucrite-br
Shock stage:moderate
Weathering grade:moderate
Ferrosilite (mol%):41.1±2.9, 38.3±2.8, 20.7±2.7
Wollastonite (mol%):2.2±1.0, 10.4±3.5, 41.2±0.1
Classifier:D. Sheikh, FSU
Type spec mass (g):20.77
Type spec location:UCLA
Main mass:Matthew Stream
Comments:Submitted by Daniel Sheikh
Institutions
   and collections		 UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
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Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1315 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters)

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