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Northwest Africa 11395 | |||||||||||||||||||||||||||
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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: 389 g | ||||||||||||||||||||||||||
Classification history: |
This is 1 of 459 approved meteorites classified as Howardite. [show all] Search for other: Achondrites, HED achondrites, and Howardites | ||||||||||||||||||||||||||
Comments: | Approved 6 Aug 2017 | ||||||||||||||||||||||||||
Writeup |
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: MB106 Table 0 Line 0: |
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Institutions and collections |
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013) |
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Catalogs: |
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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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Geography: |
Statistics: This is 1 of 9589 approved meteorites from (Northwest Africa) (plus 1869 unapproved names) | ||||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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