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Northwest Africa 13363
Basic information Name: Northwest Africa 13363
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13363
Observed fall: No
Year found: 2020
Country: Algeria
Mass:help 54 g
Classification
  history:
Recommended:  Angrite    [explanation]

This is 1 of 35 approved meteorites classified as Angrite.   [show all]
Search for other: Achondrites, Angrites
Comments: Approved 7 Jul 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13363 (NWA 13363)

Algeria

Find: 2020 Jan

Classification: Angrite

History: Found in January 2020 by Ali Muftah in Algeria. Later purchased from Ali Muftah in March 2020 by Youssef Bennani.

Physical characteristics: Sample is a single stone covered with a relatively fresh, dark-gray fusion crust containing visible vesicles.

Petrography: (D. Sheikh, FSU) This sample exhibits a fine-grained, subophitic texture (grain size up to 200µm, Av. 100µm) composed primarily of twinned anorthite laths, Al-Ti-rich augite, and Ca-rich olivine (some are polycrystalline). Al-Ti-rich augite and Ca-rich olivine grains often display strong compositional zoning; in the case of Ca-rich olivine, several grains are rimmed by kirschsteinite. Accessory mineral phases include Al-bearing titanomagnetite and troilite. Vesicles are visible throughout the thin section.

Geochemistry: Olivine (Fa50.6±15.1 Ln4.4±5.4, range Fa32.2-79.7 Ln1.2-20.3, FeO/MnO = 79±12, n=38), Kirschsteinite (Fa61.2±1.4Ln33.7±1.4, range Fa60.3-62.8Ln32.3-34.9, FeO/MnO = 70±12, n=3), Al-Ti-rich augite (Fs30.9±12.1Wo51.1±0.9, range Fs19.1-49.0Wo49.3-52.7, Al2O3 wt% = 7.0±1.0, TiO2 wt% = 2.6±1.4, FeO/MnO = 101±13, n=17), Anorthite (An99.6±0.2, range An99.4-99.8, n=20).

Classification: Angrite. The Fe/Mn ratio and presence of anorthite, Ca-rich olivine, kirschsteinite, Al-Ti-rich augite, and vesicles in the sample point to the Angrite meteorite group.

Specimens: 11.2 grams at UCLA; main mass with Youssef Bennani.

Data from:
  MB109
  Table 0
  Line 0:
Date:2020 Jan
Mass (g):54
Pieces:1
Class:Angrite
Shock stage:low
Weathering grade:low
Fayalite (mol%):50.6±15.1 (N=38)
Ferrosilite (mol%):30.9±12.1 (N=17)
Wollastonite (mol%):51.1±0.9 (N=17)
Magnetic suscept.:3.18
Classifier:D. Sheikh, FSU
Type spec mass (g):11.2
Type spec location:UCLA
Main mass:Youssef Bennani
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:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Daniel Sheikh         
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1017 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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