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Northwest Africa 13517
Basic information Name: Northwest Africa 13517
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13517
Observed fall: No
Year found: 2009
Country: (Northwest Africa)
Mass:help 49.7 g
Meteoritical Bulletin:  MB 109  (2020)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 322 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 19 Nov 2020
Writeup from MB 109:

Northwest Africa 13517 (NWA 13517)

(Northwest Africa)

Purchased: 2009 Jun

Classification: Martian meteorite (shergottite)

History: Purchased from a Moroccan mineral dealer at the meteorite show in Ensisheim, France

Physical characteristics: Subrounded meteorite fragments without fusion crust.

Petrography: (K. Metzler, IfP) Igneous rock with gabbroic texture, consisting of about 70% pyroxene (grain sizes up to ~1.5 mm) and 30% Plagioclase (maskelynite; grain sizes up to ~2 mm). Pyroxene shows very thin exsolution lamellae (< 1 µm thickness) and patchy zoning with augitic (mostly pyroxene cores) and pigeonitic (mostly pyroxene rims) compositions. Plagioclase is completely transformed to maskelynite by shock metamorphism. Shock melt pockets are present, showing a swirly pattern of intermingled melts of pyroxene and plagioclase. Faylitic olivine occurs along grain boundaries. Accessories are ilmenite, Cl-apatite, merrillite, SiO2, and small amounts of FeS.

Geochemistry: Mineral compositions and geochemistry: Composition of augitic pyroxene areas (mostly pyroxene cores): Fs22.3±0.8Wo33.4±1.7 (Fs21.0-23.7Wo30.5-37.0); mean Fe/Mn (at.): 30.4; n=12. Composition of pigeonitic pyroxene areas (mostly pyroxene rims): Fs56.6±1.6Wo13.8±0.7 (Fs53.3-58.4Wo12.8-14.9); mean Fe/Mn (at.): 38.2; n=12. Composition of olivine: Fa85.4±0.4 (Fa84.6-85.9); n=7. Composition of plagioclase (maskelynite): An53.9±3.1Or1.0±0.5 (An46.6-58.2Or0.3-1.9); n=18.

Classification: Martian (Shergottite)

Data from:
  Table 0
  Line 0:
Place of purchase:Ensisheim, France
Date:P 2009 Jun
Mass (g):49.7
Class:Martian (Shergottite)
Shock stage:M-S4
Weathering grade:low
Fayalite (mol%):85.4±0.4
Ferrosilite (mol%):22.3±0.8, 56.6±1.6
Wollastonite (mol%):33.4±1.7, 13.8±0.7
Classifier:K. Metzler, IfP
Type spec mass (g):10.2
Type spec location:IfP
Main mass:IfP
Comments:Submitted by K. Metzler, IfP
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
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Public domain photographs:
Knut Metzler      

     This is 1 of 9746 approved meteorites from (Northwest Africa) (plus 1855 unapproved names)

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