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Northwest Africa 8736
Basic information Name: Northwest Africa 8736
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8736
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 143.7 g
Meteoritical Bulletin:  MB 104  (2015)  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 4 Feb 2015
Writeup from MB 104:

Northwest Africa 8736 (NWA 8736)

(Northwest Africa)

Purchased: Oct 2014

Classification: HED achondrite (Howardite)

History: Purchased by Habib Naji from a Moroccan meteorite hunter in Guelmin, Morocco, October 2014.

Physical characteristics: Single stone with weathered black fusion crust. A broken surface reveals a breccia with white clasts set in a fine-grained, light gray matrix; small (~1 mm) distinctive black CM fragments scattered throughout.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a highly brecciated howardite with ~30% diogenitic pyroxenes, ~20% equilibrated cumulate eucrite pyroxenes, and ~50% equilibrated basaltic eucrite clasts. Howardite lithologies contain accessory Fe-Ni metal, troilite, chromite, silica, apatite, and ilmenite. CM2 xenoliths show moderate foliation, with scattered type I chondrules, ~70%, phyllosilicate-rich matrix, FeNiS phase, troilite.

Geochemistry: (C. Agee and N. Muttik, UNM) Diogenite orthopyroxene Fs27.4±6.4Wo2.4±0.3, Fe/Mn=30±2, n=7; cumulate eucrite low-Ca pyroxene Fs45.7±4.4Wo2.1±1.1, Fe/Mn=29±1, n=3, cumulate eucrite augite Fs18.8Wo41.8, Fe/Mn=23, n=1; cumulate eucrite pigeonite Fs35.7±0.0Wo14.8±0.8, Fe/Mn=28±2, n=2, basaltic eucrite low-Ca pyroxene Fs61.0±4.0Wo3.7±2.7, Fe/Mn=32±1, n=8; basaltic eucrite augite Fs35.6±7.7Wo42.1±0.5, Fe/Mn=37±3, n=2; basaltic eucrite pigeonite Fs45.7Wo18.3, Fe/Mn=31, n=1; plagioclase An87.4±3.7, n=6. CM2 xenoliths: type I chondrule olivine Fa2.3±1.1, Cr2O3=0.44±0.11 (wt%), n=6; ferroan olivine Fa37.9, Fe/Mn=111, Cr2O3=0.40 (wt%), n=1; enstatite Fs1.7Wo0.7, n=1; aluminous augite Fs1.9Wo29.5, n=1.

Classification: Achondrite (howardite) with three lithologies: 1) diogenite, 2) equilibrated cumulate eucrite, 3) equilibrated basaltic eucrite. Xenolithic CM2 clasts are present throughout. Low weathering grade, high shock stage.

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

Data from:
  Table 0
  Line 0:
Place of purchase:Guelmin, Morocco
Date:P Oct 2014
Mass (g):143.7
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):27.4±6.4, 45.7±4.4, 61.0±4.0
Wollastonite (mol%):2.4±0.3, 2.1±1.1, 3.7±2.7
Classifier:C. Agee, UNM
Type spec mass (g):20.2
Type spec location:UNM
Main mass:Habib Naji
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. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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