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Northwest Africa 8455
Basic information Name: Northwest Africa 8455
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8455
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 2.81 kg
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Lunar
Recommended:  Lunar    [explanation]

This is 1 of 88 approved meteorites classified as Lunar.   [show all]
Search for other: Lunar meteorites
Comments: Approved 23 Jun 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8455 (NWA 8455)

(Northwest Africa)

Purchased: 2014

Classification: Lunar meteorite

History: Purchased from a Moroccan meteorite dealer in 2014.

Physical characteristics: Single stone, no fusion crust, irregular exterior with desert patina, freshly broken surface and saw cut reveals a few scattered millimeter-sized white feldspar clasts set in a very dark gray groundmass.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows this specimen to be a fragmental breccia composed of clasts (up to ~500 μm) of individual plagioclase, pyroxene, olivine grains, and also lithic clasts (up to ~1 mm) of gabbro and shock melt, set in a pervasive matrix of micrometer- to submicrometer-sized silicates. Accessory ilmenite, silica polymorph, chromite, phosphate, Fe-metal.

Geochemistry: (C. Agee and N. Muttik). Olivine Fa26.6±3.5, Fe/Mn=100±9, n=28; pigeonite Fs26.2±6.2Wo8.7±4.4, Fe/Mn=58±5, n=22; augite Fs21.5±8.4Wo34.5±6.8, Fe/Mn=55±11, n=11; plagioclase An95.1±1.0Ab4.5±1.0Or0.4±0.1, n=4. Shock melt (proxy for bulk composition) SiO2=44.6±1.1, TiO2=0.59±0.53, Al2O3=26.1±3.2, Cr2O3=0.10±0.03, MgO=6.8±1.8, FeO=5.0±1.3, MnO=0.04±0.03, NiO=0.02±0.01, Na2O=0.69±0.20, K2O=0.19±0.04 (all wt%).

Classification: Achondrite (lunar feldspathic breccia)

Specimens: 20.5 g, including a probe mount is on deposit at UNM. J. Piatek holds the main mass.

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2014
Mass (g):2814
Pieces:1
Class:Lunar
Classifier:C. Agee, UNM
Type spec mass (g):20.5
Type spec location:UNM
Main mass:J. Piatek
Comments:Submitted by C. Agee
Institutions
   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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Denis gourgues   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7005 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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