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Northwest Africa 13939
Basic information Name: Northwest Africa 13939
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13939
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass:help 57 g
Classification
  history:
Meteoritical Bulletin:  MB 110  (2022)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 324 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 29 May 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13939 (NWA 13939)

(Northwest Africa)

Purchased: 2010 Jun

Classification: Martian meteorite (Shergottite)

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

Physical characteristics: Fragment without fusion crust.

Petrography: (K. Metzler, IfP). Ultramafic igneous rock, mainly consisting of various pyroxenes, olivine, and some plagioclase. It exhibits a cumulate texture with grain sizes in the mm range with pyroxene-rich domains up to ~8 mm. Point counting on BSE images (n=175; area 1.6 cm2) revealed 46 vol% olivine, 47 vol% pyroxenes with various compositions, and 7 vol% plagioclase. Three different pyroxene varieties were found. Olivine partially shows brownish staining in transmitted light. It occurs in paragenesis with pyroxene and plagioclase and as poikilitically enclosed grains in the pyroxene-rich domains. Plagioclase is completely transformed to maskelynite by shock metamorphism. Vesicular shock melt pockets and veins are present, showing quench textures. Accessories are Mg-bearing ilmenite, two different varieties of chromium spinel, merrillite, and small amounts of pyrrhotite with tiny pentlandite inclusions.

Geochemistry: Mineral compositions and geochemistry: Olivine: Fa34.1±1.6 (Fa29.5-36.4); mean Fe/Mn (at.): 49.9; n=16. Pyroxene #1: Fs20.1±0.8 Wo2.9±0.3 (Fs19.0-21.0 Wo2.5-3.1); mean Fe/Mn (at.): 29.8; n=4. Pyroxene #2: Fs26.8±3.4 Wo9.4±1.5 (Fs21.9-30.8 Wo6.7-11.7); mean Fe/Mn (at.): 28.9; n=17. Pyroxene #3: Fs16.9±0.6 Wo32.3±1.7 (Fs16.0-18.0 Wo30.5-36.0); mean Fe/Mn (at.): 24.3; n=12. Plagioclase (maskelynite) An51.6±2.1 Or1.3±0.4 (An48.4-54.7 Or0.5-1.9); n=14. Chromium spinel #1: Atomic Cr/(Cr+Al)=0.87-0.89; Mg/(Mg+Fe)=0.25-0.34; TiO2=0.9-1.0 wt%; n=5. Chromium spinel #2: Atomic Cr/(Cr+Al)=0.79-0.82; Mg/(Mg+Fe)=0.10-0.16; TiO2=11.7-16.1 wt%; n=5.

Classification: Achondrite (martian, ultramafic shergottite)

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Ensisheim, France
Date:P 2010 Jun
Mass (g):57
Pieces:1
Class:Martian (shergottite)
Shock stage:U-S5
Weathering grade:low
Fayalite (mol%):34.1
Ferrosilite (mol%):20.1; 26.8; 16.9
Wollastonite (mol%):2.9; 9.4; 32.3
Classifier:K. Metzler, IfP
Type spec mass (g):11.6
Type spec location:IfP
Main mass:anonymous
Comments:Submitted by K. Metzler, IfP
Institutions
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
Catalogs:
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Qi Lv   
Public domain photographs:
Knut Metzler      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9747 approved meteorites from (Northwest Africa) (plus 1866 unapproved names)

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