![]() |
||
|
Northwest Africa 8658 | |||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic information | Name: Northwest Africa 8658 This is an OFFICIAL meteorite name. Abbreviation: NWA 8658 Observed fall: No Year found: 2013 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 391 approved meteorites classified as Eucrite-pmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||||
Comments: | Approved 18 Feb 2015 | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 104:
Northwest Africa 8658 (NWA 8658) (Northwest Africa) Purchased: Nov 2013 Classification: HED achondrite (Eucrite, polymict) Petrography: (P. Warren, UCLA) This meteorite is a polymict eucrite with many distinct, sharply bounded clasts, including one that is uncommonly rich in silica. Minor Fe-metal. Geochemistry: Clasts, and thus mineral compositions, are diverse. Pyroxene compositions extend to En65.1Wo5.6, En35.3Wo2.5, En30.5Wo43.4, En7.5Wo11.5 and En5.5Wo44.5; plagioclase ranges from An71 to An94, minor olivine from Fa62 to Fa87. Averages of the disparate clasts are: low-Ca pyroxene En50.4±12.2Wo7.6±1.7, FeO/MnO wt. ratio 30.1±1.2, n=28; med-Ca pyroxene En27.6±7.0Wo18.5±5.1, n=19; high-Ca pyroxene En20.4±6.5Wo39.0±4.5, n=8; plagioclase An85.0±5.7, n=97; olivine Fa80.3±4.5, n=30. Classification: Eucrite (polymict). | ||||||||||||||||||||||||||||||
Data from: MB104 Table 0 Line 0: |
|
||||||||||||||||||||||||||||||
Institutions and collections |
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011) |
||||||||||||||||||||||||||||||
Catalogs: |
| ||||||||||||||||||||||||||||||
References: | Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
| ||||||||||||||||||||||||||||||
Geography: |
Statistics: This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names) |