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Northwest Africa 11395
Basic information Name: Northwest Africa 11395
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11395
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 389 g
Meteoritical Bulletin:  MB 106  (2018)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 421 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 6 Aug 2017
Writeup from MB 106:

Northwest Africa 11395 (NWA 11395)

(Northwest Africa)

Purchased: 2017

Classification: HED achondrite (Howardite)

History: A single stone weighing 389 g was found in Morocco prior to 2016. Steve Arnold acquired the sample from a meteorite dealer at the Tucson Gem and Mineral Show in February of 2017.

Physical characteristics: Sample is tan in color, subrounded, and lacks fusion crust. The cut face shows a brecciated texture composed of up to 1 cm-sized light, orange- and dark-colored clasts.

Petrography: Description and classification (A. Love, App): Sample is a polymict breccia composed of dominant subrounded, irregularly shaped, clasts of diogenite and cataclastic diogenite (~35 vol%), basaltic and cumulate eucrite (~10 vol%) containing exsolved and inverted pyroxenes, impact melt clasts, minor Fe-rich symplectites (silica + chromite and silica + plagioclase + FeS) set within fragmental mineral debris composed of these lithologies. Several of the diogenite clasts display clean clastic rims composed and heavily brecciated interiors with a transected by orange-colored FeO-rich veins. Minerals: Ca-poor and Ca-rich pyroxenes, olivine, plagioclase, FeS grains, ilmenite, chromite, Si-polymorph, apatite, FeNi metal.

Geochemistry: (A. Love, App) Eucrite: Low-Ca pyroxene Fs39.6±7.6Wo3.6±-0.8 (Fs29.3-54.4Wo2.0-5.6, FeO/MnO=27.2-36.5, N=15); Pigeonite host Fs48.3±3.9Wo8.4±1.7 (Fs40.7-51.3Wo5.6-10.2, Fe/Mn=30.8-32.7, N=5); high-Ca pyroxene exsolution lamellae Fs22.2±5.2Wo41.5±1.2 (Fs12.6-30.1Wo38.8-42.1, FeO/MnO=29.1-43.0, N=11); plagioclase An83.6.7±4.2Or0.9±0.5 (An72.9-88.7Or0.5-2.2, N=12); Diogenite: low-Ca pyroxene Fs20.5±2.5Wo2.4±0.8 (Fs12.7-25.7Wo1.1-4.3, Fe/Mn=24.8-34.1, N=21); Olivine Fa 27.9±10.0 (Fa14.1-37.4, Fe/Mn=50.03, N=3).

Classification: HED (Howardite). Sample is a howardite based on the abundance of diogenite and eucrite within the sample. Textures, mineralogy and Fe/Mn ratios of pyroxenes and olivines within clastic components are consistent HED eucrites and diogenites.

Specimens: Steve Arnold holds the main mass. The 20 g type specimen (two slices and several small fragments) and one polished thin section are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2017
Mass (g):389
Shock stage:moderate
Weathering grade:low
Classifier:A. Love, App
Type spec mass (g):20.0
Type spec location:App
Main mass:Steve Arnold
Comments:Submitted by Anthony Love
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
References: Published in Gattacceca J., Bouvier A., Grossman J., Metzler K., and Uehara M. (2019) Meteoritical Bulletin, no. 106. Meteorit. Planet. Sci. 54 in press.
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     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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