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Northwest Africa 10618
Basic information Name: Northwest Africa 10618
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10618
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 93.8 g
Meteoritical Bulletin:  MB 105  (2016)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 284 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 30 Apr 2016
Writeup from MB 105:

Northwest Africa 10618 (NWA 10618)

(Northwest Africa)

Purchased: 2015 Oct

Classification: Martian meteorite (Shergottite)

History: Purchased in Erfoud, Morocco by Aziz Habibi in October 2015.

Physical characteristics: The specimen (93.8 g) has an overall dark-gray interior with irregularly distributed, larger orangeish grains (oikocrysts).

Petrography: (A. Irving and S. Kuehner, UWS) Large, twinned prismatic grains (up to 1.1 cm long) of low-Ca pyroxene (pale orange in thin section) enclose small olivine chadacrysts. The dominant portion is a microgabbroic aggregate of olivine, pigeonite, subcalcic augite and maskelynite, with accessory Ti-rich chromite, Cr-bearing ilmenite, merrillite, chlorapatite, pyrrhotite and minor baddeleyite. All olivine is variably tan to deep brown in thin section (indicative of high shock).

Geochemistry: (S. Kuehner, UWS; P. Carpenter, WUSL) Olivine chadacrysts (Fa39.9-40.1, FeO/MnO = 47, N = 3), low-Ca pyroxene oikocryst (core Fs25.8Wo5.3; rim Fs30.0Wo8.8, FeO/MnO = 28-29, N = 2), pigeonite (Fs29.2-30.1Wo10.3-11.3, FeO/MnO = 27-29, N = 4), sucalcic augite (Fs19.2-20.5Wo31.1-31.8, FeO/MnO = 23-24, N = 3), maskelynite (An52.7-54.6Or2.4-2.3, N = 2).

Classification: Martian (shergottite, poikilitic).

Specimens: 21.4 g including one polished thin section and one polished mount at UWB; remainder with Mr. A. Habibi.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2015 Oct
Mass (g):93.8
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Fayalite (mol%):39.9-40.1
Ferrosilite (mol%):25.8; 29.2-30.1; 19.2-20.5
Wollastonite (mol%):5.4; 10.3-11.3; 31.1-31.8
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):21.4
Type spec location:UWB
Main mass:A. Habibi
Comments:AH 004; submitted by A. Irving
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     This is 1 of 8636 approved meteorites from (Northwest Africa) (plus 1884 unapproved names)

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