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Northwest Africa 10258
Basic information Name: Northwest Africa 10258
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10258
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 58 g
Meteoritical Bulletin:  MB 104  (2015)  Lunar (feldsp. breccia)
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 288 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 8 Sep 2015
Writeup from MB 104:

Northwest Africa 10258 (NWA 10258)

(Northwest Africa)

Purchased: 2015

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased by Steve Arnold from Morocco, 2015.

Physical characteristics: Single stone, dark irregular surface, no fusion crust. A saw cut reveals numerous light-colored clasts set in a dark groundmass.

Petrography: (C. Agee, UNM) This meteorite is mixture of a fine-grained cataclastic domains, fragmental plagioclase and pyroxene crystals, fragmental anorthosite clasts, and shock melt veins; some of the veins have ~200 μm-size vesicles. Accessory troilite, ilmenite, and chromite were observed.

Geochemistry: (C. Agee and N. Muttik, UNM) olivine Fa37.9±1.3, Fe/Mn=98±7, n=6; pigeonite Fs38.9±13.7Wo11.5±6.0, Fe/Mn=62±10, n=5; augite Fs22.7Wo40.0, Fe/Mn=57±5, n=1; plagioclase An96.2±0.5, n=3; Shock melt (20 μm defocused electron beam, proxy for bulk meteorite composition): SiO2=46.3±1.8, TiO2=0.44±0.18, Al2O3=26.9±5.3, Cr2O3=0.014±0.10, MgO=5.6±2.7, FeO=6.4±3.2, MnO=0.08±0.05, CaO=14.4±2.0, NiO=0.03±0.03, Na2O=0.54±0.24, K2O=0.14±0.07 (all wt%), MgO+FeO=12.1±5.5 (wt%), n=11.

Classification: Lunar (feldspathic breccia)

Specimens: 11.7 g including a probe mount on deposit at UNM, Steve Arnold holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2015
Mass (g):58
Class:Lunar (feldsp. breccia)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):37.9±1.3
Ferrosilite (mol%):38.9±13.7
Wollastonite (mol%):11.5±6.0
Classifier:C. Agee, UNM
Type spec mass (g):11.7
Type spec location:UNM
Main mass:Steve Arnold
Comments:Fieldname SA-12; 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. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
John Tanner   

     This is 1 of 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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