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Northwest Africa 13360
Basic information Name: Northwest Africa 13360
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13360
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 187 g
Classification
  history:
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 229 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 2 Aug 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13360 (NWA 13360)

Northwest Africa

Purchased: 2020 Jan

Classification: Martian meteorite (Shergottite)

History: Purchased in January 2020 by Noreddine Azelmat from a moroccan dealer.

Physical characteristics: Single stone lacking fusion crust. A slice of the interior reveals a relatively coarse-grained rock containing brown olivines and gray-green pyroxenes.

Petrography: (Daniel Sheikh, FSU) Sample exhibits a predominantly poikilitic texture (grain size Av. 750±100 µm, up to 2.5 mm) composed of compositionally zoned low-Ca pyroxene oikocrysts enclosing sub-angular olivine chadacrysts. Also present include compositionally zoned, tabular, irregular grains of pigeonite and augite, as well as laths of maskelynite. Accessory phases include chromite (some Ti-rich), ilmenite, pyrrhotite, merrillite, pentlandite, and Si-Al-rich glass. Sample contains minor carbonate weathering veins.

Geochemistry: Olivine (Fa35.0±1.8, range Fa30.4-39.4, FeO/MnO=48±5, n=75), low-Ca pyroxene (Fs21.3±0.4Wo4.1±0.6, range Fs20.5-22.5 Wo3.5-5.2, FeO/MnO=30±3, n=30), pigeonite (Fs25.5±3.2Wo9.2±2.8, range Fs21.8-30.1Wo6.1-15.4, FeO/MnO=30±3, n=31), subcalcic augite (Fs16.4±0.8Wo31.9±2.1, range Fs15.2-17.7Wo27.9-34.9, FeO/MnO=22±2, n=20), maskelynite (An54.2±1.4Or1.4±0.2, range An51.3-56.3Or1.1-1.7, n=20).

Classification: Shergottite (poikilitic). Silicate chemistry, the presence of maskelynite, and FeO/MnO ratios of pyroxenes provide support for classification as shergottite. Predominant poikilitic texture argues for classification as poikilitic shergottite.

Specimens: 20.05 g at UCLA; main mass with Noreddine Azelmat.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020 Jan
Mass (g):187
Pieces:1
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Fayalite (mol%):35.0±1.8
Ferrosilite (mol%):21.3±0.4, 25.5±3.2, 16.4±0.8
Wollastonite (mol%):4.1±0.6, 9.2±2.8, 31.9±2.1
Magnetic suscept.:3.65
Classifier:D. Sheikh, FSU
Type spec mass (g):20.05
Type spec location:UCLA
Main mass:Noreddine Azelmat
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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Photos:
CreditPhotos
Public domain photographs:
Daniel Sheikh   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7354 approved meteorites from (Northwest Africa) (plus 1958 unapproved names)

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