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Northwest Africa 10472
Basic information Name: Northwest Africa 10472
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10472
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 39.9 g
Meteoritical Bulletin:  MB 105  (2016)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 427 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 24 Jan 2016
Writeup from MB 105:

Northwest Africa 10472 (NWA 10472)

(Northwest Africa)

Purchased: 2015 Jul

Classification: HED achondrite (Howardite)

History: Found in far-western Algeria in early June 2015.

Physical characteristics: Single stone with fusion crust. A sawn surface shows finely brecciated texture with white, gray, and black clasts.

Petrography: (C. Agee, UNM) This meteorite contains at least six different lithologies: diogenite ~40%, cumulate eucrite ~10%, basaltic eucrite ~50%, carbonaceous chondrite CM2 ~1%, stony-iron (pallasite-like) <1%, and stony-iron (mesosiderite-like) <1%. The CM2 and stony-iron clasts are approximately 500 μm in size. The CM2 clasts are rounded or oval in shape and consist primarily of magnesian-rich chondrules set in a groundmass of phyllosilicates. The pallasite-like clast observed has a typical pallasite texture of rounded olivines suspended in Fe-Ni metal, although the olivine grain size (~100 μm) is much smaller than typical PMG. The mesosiderite-like clast is unbrecciated and consists of equilibrated pyroxenes, plagioclase, silica, and Fe-Ni metal; it most resembles a type A3 mesosiderite. Most HED domains consist of fragmental mineral grains, although there are also a few intersertal basaltic clasts Accessory silica, ilmenite, and chromite were observed.

Geochemistry: (C. Agee and N. Muttik, UNM) Diogenite: low-Ca pyroxene Fs26.3±4.9Wo3.1±2.2, Fe/Mn=30±2, n=8. Cumulate eucrite: low-Ca pyroxene Fs42.8±5.0Wo3.1±1.2, Fe/Mn=30±1, n=5; high-Ca pyroxene Fs19.2±0.4Wo44.1±1.0, Fe/Mn=26±0, n=2. Basaltic eucrite: low-Ca pyroxene Fs62.9±0.3Wo2.3±1.0, Fe/Mn=32±1, n=6; high-Ca pyroxene Fs30.6±3.1Wo40.9±2.8, Fe/Mn=32±1, n=3, plagioclase An91.7±3.3, n=5. CM2: forsterite Fa1.5±1.0, Cr2O3 (wt%)=0.46±0.20, n=9; enstatite Fs1.6±0.5Wo1.3±0.7, n=6. Pallasite-like clast: olivine Fa9.7±0.2, Fe/Mn=47±3, n=6. Mesosiderite-like clast: pigeonite Fs55.7±1.6Wo11.7±1.6, Fe/Mn=34±1, n=5; high-Ca pyroxene Fs28.9±3.4Wo38.0±4.7, Fe/Mn=27±2, n=6; plagioclase An89.6±4.6, n=2.

Classification: Howardite (xenolith-bearing). Howardite classification based on the presence of diogenite, cumulate eucrite, and basaltic eucrite lithologies. There are also three xenolithic lithologies present: 1) CM2 lithology, 2) main group pallasite-like lithology, 3) A3 mesosiderite-like lithology.

Specimens: 9.6 g including a probe mount on deposit at UNM, DPitt holds the main mass.

Data from:
  Table 0
  Line 0:
Date:P 2015 Jul
Mass (g):39.9
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):26.3±4.9, 42.8±5.0, 62.9±0.3
Wollastonite (mol%):3.1±2.2, 3.1±1.2, 2.3±1.0
Classifier:C. Agee, UNM
Type spec mass (g):9.6
Type spec location:UNM
Main mass:DPitt
Comments:Field name MAC 166; 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)
DPitt: Darryl Pitt, 225 West 83rd Street, New York, NY 10024, United States; Website (private address)
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 8777 approved meteorites from (Northwest Africa) (plus 1879 unapproved names)

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