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Northwest Africa 8440
Basic information Name: Northwest Africa 8440
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8440
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 146.2 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 453 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 6 Jun 2014
Revised 16 Jan 2020: corrected number of stones in MB103 table
Writeuphelp
Writeup from MB 103:

Northwest Africa 8440 (NWA 8440)

(Northwest Africa)

Purchased: 2014

Classification: HED achondrite (Howardite)

History: Purchased from a Moroccan meteorite dealer in 2014.

Physical characteristics: Four identically appearing stones. Dark irregular exterior, saw cuts reveals fresh-appearing breccia with white, green, and dark gray clasts.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a fragmental to cataclastic breccia with equilibrated (exsolution lamellae) and unequilibrated (igneous zoned) pyroxenes throughout. Silica, troilite, ilmenite, chromite, kamacite, and taenite present. Some shock melt veins observed. Approximately 25% of this meteorite is diogenitic, ~50% is basaltic eucrite, and ~25% is cumulate eucrite.

Geochemistry: (C. Agee and N. Muttik, UNM) Diogenite minerals: low-Ca pyroxene Fs26.9±6.8Wo3.2±0.4, Fe/Mn=31±1, n=4; plagioclase An95.2±0.6Ab4.6±0.6Or0.2±0.1, n=4. Basaltic eucrite minerals: low-Ca pyroxene Fs55.1±3.3Wo8.8±4.1, Fe/Mn=32±1, n=8; augite Fs30.6±2.4Wo38.7±1.5, Fe/Mn=30±5, n=5; plagioclase An89.2Ab10.3Or0.5, n=1. Cumulate eucrite minerals: low-Ca pyroxene Fs39.1±2.5Wo3.7±0.3, Fe/Mn=29±1, n=4; plagioclase An91.0Ab8.6Or0.4, n=1.

Classification: Achondrite (Howardite)

Specimens: 26.7 g on deposit at UNM, D. Chenin holds the main mass.

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2014
Mass (g):146.2
Pieces:4
Class:Howardite
Shock stage:high
Weathering grade:low
Classifier:C. Agee, UNM
Type spec mass (g):26.7
Type spec location:UNM
Main mass:D. Chenin
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:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9914 approved meteorites from (Northwest Africa) (plus 1841 unapproved names)

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