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Northwest Africa 8744
Basic information Name: Northwest Africa 8744
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8744
Observed fall: No
Year found: 2014
Country: (Northwest Africa)
Mass:help 12.57 kg
Meteoritical Bulletin:  MB 104  (2015)  Diogenite
Recommended:  Diogenite    [explanation]

This is 1 of 485 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 10 Feb 2015
Writeup from MB 104:

Northwest Africa 8744 (NWA 8744)

(Northwest Africa)

Purchased: 2014 Sep

Classification: HED achondrite (Diogenite)

History: In September 2014 two large stones were purchased by Aziz Habibi in Agadir, Morocco, and two smaller stones were purchased by Gary Fujihara from a dealer in Zagora, Morocco.

Physical characteristics: The four pieces (11001 g, 1356 g, 185 g, 25.2 g) all share the same distinctive appearance. Domains composed of gray pyroxene plus variable amounts of milky plagioclase occur within a predominant lithology composed of highly vesicular, very fine grained material.

Petrography: (A. Irving and S. Kuehner, UWS) Melt-matrix breccia consisting of clasts (~30 vol.%) of orthopyroxenitic diogenite, feldspathic diogenite and noritic diogenite (with 10-40 vol.% plagioclase) plus related crystalline debris within a predominant, very fine grained, vesicular matrix. All orthopyroxene is turbid and pale clove brown in thin section and is notably ferroan; calcic plagioclase (anorthite) is polycrystalline. Some orthopyroxene contains irregular "patches" of clinopyroxene. Accessory phases are chromite, olivine and minor troilite blebs in orthopyroxene.

Geochemistry: Orthopyroxene in clasts (Fs35.4-37.0Wo6.5-4.3, FeO/MnO = 29-31, N = 5), clinopyroxene in clast (Fs16.1Wo40.8, FeO/MnO = 27), "patchy" pigeonitic pyroxene (Fs26.4-38.0Wo6.4-10.8, FeO/MnO = 29-30, N = 3), pigeonite in vesicular matrix (Fs42.5Wo13.4, FeO/MnO = 27), olivine (Fa48.9, FeO/MnO = 44, N = 1), plagioclase (An93.5-95.6Or0.2-0.1, N = 3).

Classification: Diogenite (feldspathic, shock melted). The amount of plagioclase in some of the remnant diogenitic clasts is higher than in typical diogenites, and low-Ca pyroxene is unusually ferroan. There is evidence for intense shock modification in this material (involving extensive melting and vesiculation).

Specimens: 21.3 g including two polished thin sections and one polished slice at UWB; main masses of the large stones are with Mr. A. Habibi; Mr. G. Fujihara owns the 185 g and 25.2 g stones.

Data from:
  Table 0
  Line 0:
Place of purchase:Erfoud
Date:P 2014 Sep
Mass (g):12567
Shock stage:high
Weathering grade:low
Fayalite (mol%):48.9
Ferrosilite (mol%):35.4-37.0
Wollastonite (mol%):6.5-4.3
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):21.3
Type spec location:UWB
Main mass:A. Habibi
Comments:AH 104; submitted by A. Irving
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
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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Carlos Di Pietro Bella      
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     This is 1 of 8138 approved meteorites from (Northwest Africa) (plus 1941 unapproved names)

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