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Northwest Africa 10985
Basic information Name: Northwest Africa 10985
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10985
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 250 g
Meteoritical Bulletin:  MB 105  (2016)  Lunar (gabbro)
Recommended:  Lunar (gabbro)    [explanation]

This is 1 of 13 approved meteorites classified as Lunar (gabbro).   [show all]
Search for other: Lunar meteorites
Comments: Approved 17 Dec 2016
Writeup from MB 105:

Northwest Africa 10985 (NWA 10985)

(Northwest Africa)

Purchased: 2015

Classification: Lunar meteorite (gabbro)

History: Purchased by Jay Piatek in Morocco, 2015.

Physical characteristics: Single stone, weathered exterior without fusion crust. A polished saw cut surface reveals two distinct lithologies separated by a sharp boundary offset, with numerous truncated grains. One lithology is a light colored, medium-grained gabbro with elongate subhedral prismatic yellow-green pyroxenes and white subhedral plagioclase laths. The second lithology is a dark colored, fine-grained breccia with yellow-green pyroxene fragments scattered throughout. Fine shock melt veins visible.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows igneous-zoned pigeonite and augite, plagioclase, olivine, fayalite, hedenbergite, pyroxferroite, Fe-sulfide, ilmenite, chromite, Ti-magnetite, apatite, silica, and symplectites.

Geochemistry: (C. Agee and S. Spilde, UNM) Olivine Fa38.1±21.2, Fe/Mn=95±8, n=31; pigeonite Fs45.9±12.2Wo17.8±5.5, Fe/Mn=63±10, n=29; augite Fs41.2±16.9Wo30.8±3.9, Fe/Mn=63±11, n=18; pyroxferroite Fs84.2±1.4Wo14.8±1.4, Fe/Mn=63±2, n=3; plagioclase An89.5±3.4Ab9.8±3.1Or0.7±0.6, n=27; shock melt (proxy for bulk composition) SiO2=48.0±2.6, TiO2=1.2±0.7, Al2O3=11.3±6.0, Cr2O3=0.4±0.2, MgO=11.6±4.3, FeO=16.5±2.7, MnO=0.24±0.05, CaO=10.9±3.0, Na2O=0.28±0.17, K2O=0.17±0.11 (all wt%), n=10.

Classification: Lunar gabbro

Specimens: 20.2 g including a probe mount on deposit at UNM, Jay Piatek holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2015
Mass (g):250
Class:Lunar (gabbro)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):38.1±21.2
Ferrosilite (mol%):45.9±12.2; 41.2±16.9
Wollastonite (mol%):17.8±5.5; 30.8±3.9
Classifier:C. Agee, UNM
Type spec mass (g):20.2
Type spec location:UNM
Main mass:Jay Piatek
Comments:Submitted by C. Agee
   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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     This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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