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Northwest Africa 10171
Basic information Name: Northwest Africa 10171
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10171
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 23.4 g
Classification
  history:
Meteoritical Bulletin:  MB 104  (2015)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 191 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 18 Jul 2015
Writeuphelp
Writeup from MB 104:

Northwest Africa 10171 (NWA 10171)

(Northwest Africa)

Purchased: Jan 2015

Classification: Martian meteorite (Shergottite)

History: The sample was discovered in the region of Laayoune Boujdour, and bought by Luc Labenne from an anonymous Moroccan from Zagora.

Physical characteristics: The stone is completely covered with a glossy fusion crust.

Petrography: (R. Hewins, S. Pont and B. Zanda, MNHNP) Pyroxene is prominent as large (up to 4 mm) massive or prismatic crystals. Pigeonite is intensely zoned and augite has a thin mantle of pigeonite. Pyroxene margins were subophitic to plagioclase laths. The feldspathic material is smooth, lacks cleavage or fractures. Locally it contains schlieren indicating flow. Raman spectroscopy on regions lacking schlieren indicated the presence of a dominant broad peak at 497 cm-1 characteristic of makelynite and suggesting high (>40 GPa) shock pressure (Wang et al., 2004). Accessories include ülvospinel and ilmenite.

Geochemistry: Mineral compositions and Geochemistry: (R. Hewins and S. Pont, MNHNP) Atomic Fe/Mn in pigeonite is 36 on average (n=143) and increases from 30 to 42 following the relationship of Karner et al. (2006, Fig. 6). Pigeonite is En11Fs38Wo11 to En6FsFs73Wo21. Subcalcic augite is En47Fs32Wo21 to En41Fs21Wo38. The feldspathic material is stoichiometric An51-46Ab46-49Or3-5 and has the Raman spectrum of maskelynite.

Classification: (R. Hewins and B. Zanda, MNHNP) The meteorite has SNC Fe/Mn ratios and maskelynite of SNC composition. It is classified as a shergottite.

Bibliography:
  • A. Wang, K. Kuebler, B. Jolliff, and L.A. Haskin (2012) Mineralogy of a Martian meteorite as determined by Raman spectroscopy. J. Raman Spec. 6, 504-514. (link)
Data from:
  MB104
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P Jan 2015
Mass (g):23.4
Pieces:1
Class:Martian (shergottite)
Ferrosilite (mol%):54.6±10.1 (38.1-75.3, n = 143); 30.3±10.6
Wollastonite (mol%):18.0±3.8 (10.5-27.4, n = 143); 29.7±7.1
Classifier:R. Hewins and B. Zanda, MNHNP
Type spec mass (g):4.7
Type spec location:MNHNP
Main mass:Labenne
Comments:Data files are labelled LM 240315 V.; submitted by R. Hewins
Institutions
   and collections
MNHNP: Museum National d'Histoire Naturelle, IMPMC-CP52, 57 rue Cuvier, 75005 Paris, France, France; Website (institutional address)
Labenne: 23, rue de Esperance, 75013 Paris, France; Website (private address; updated 29 Aug 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6877 approved meteorites from (Northwest Africa) (plus 2037 unapproved names)

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