22.46g Eucrite Monomict Slice | HED NWA 8555
|Northwest Africa 8555|
Name: Northwest Africa 8555
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8555
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass: 2.92 kg
This is 1 of 187 approved meteorites classified as Eucrite-mmict. [show all]
Search for other: Achondrites,Eucrites, and HED achondrites
|Comments:||Approved 18 Oct 2014|
Writeup from MB 103:
Northwest Africa 8555 (NWA 8555)
Classification: HED achondrite (Eucrite, monomict)
History: Purchased by Brahim Tahiri from a Moroccan hunter and sent to his partner Sean Tutorow for classification, April, 2013.
Physical characteristics: Two matching stones, 1729 g and 1198 g. Irregular weathered exterior. Saw cut reveals a breccia with tan lithic clasts up to 1 cm set in a dark-gray matrix.
Petrography: (C. Agee, UNM) Microprobe examination of a polished mount show basaltic eucrite clasts cross-cut by shock melt veins, pyroxenes show exsolution lamellae. Ubiquitous chromite, ilmenite, and silica, some barite found. Moderate weathering.
Geochemistry: (C. Agee and N. Muttik, UNM) Low-Ca pyroxene Fs60.7±2.2Wo4.5±2.4, Fe/Mn=33±1, n=12; high-Ca pyroxene Fs29.3±1.5Wo41.1±1.6, Fe/Mn=33±1, n=12; plagioclase An89.0±1.2, n=8.
Classification: Achondrite (monomict eucrite)
Specimens: 59.78 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass.
|UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)|
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