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Northwest Africa 10645
Basic information Name: Northwest Africa 10645
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10645
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 12 g
Meteoritical Bulletin:  MB 105  (2016)  Martian (nakhlite)
Recommended:  Martian (nakhlite)    [explanation]

This is 1 of 32 approved meteorites classified as Martian (nakhlite).   [show all]
Search for other: Martian meteorites
Comments: Approved 15 May 2016
Writeup from MB 105:

Northwest Africa 10645 (NWA 10645)

(Northwest Africa)

Purchased: 2016

Classification: Martian meteorite (Nakhlite)

History: Purchased by Dustin Dickens, February 2016, from a Moroccan dealer.

Physical characteristics: The exterior is partially covered by black fusion crust. Freshly broken surfaces reveal a mixture of mm-sized dark-green pyroxene grains and interstitial cream-colored feldspar.

Petrography: (C. Agee, UNM) This meteorite has an ophitic texture consisting of 75% augite, 15% feldspar, and 5% olivine. Some augite crystals are prismatic and up to 2 mm in length. There are two feldspars present, oligoclase and alkali feldspar, no maskelynite was observed; feldspar commonly occupies interstices between augite grains. Augites show igneous zoning with Fs-rich rims, olivines are fayalitic and fairly uniform in composition. Apatite, ilmenite, and titanomagnetite were observed.

Geochemistry: (C. Agee and M. Spilde, UNM) Olivine Fa88.1±0.8, Fe/Mn=41±1, n=5; augite Fs31.9±10.2Wo38.9±2.1, range Fs24.1-48.9Wo33.3-40.5, Fe/Mn=35±2, n=10; plagioclase An22.9±2.7Ab73.0±3.0Or4.1±0.6, n=4; alkali feldspar An3.3Ab40.4Or56.2, n=1.

Classification: Martian (nakhlite). This is a martian meteorite based Fe/Mn of augite and olivine, and on the composition of the plagioclase. It is a nakhlite based on the high percentage of augite present. Paired with NWA 10153.

Specimens: 2.5 g including a probe mount on deposit at UNM; Dustin Dickens holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2016
Mass (g):12
Class:Martian (nakhlite)
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):88.1±0.8
Ferrosilite (mol%):31.9±10.2
Wollastonite (mol%):38.9±2.1
Classifier:C. Agee, UNM
Type spec mass (g):2.5
Type spec location:UNM
Main mass:Dustin Dickens
Comments:Field name TMS-1; submitted by C. Agee, UNM
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
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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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Domjan Svilkovic   
Volker Heinrich   

     This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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