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Northwest Africa 8556 | |||||||||||||||||||||||
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Basic information | Name: Northwest Africa 8556 This is an OFFICIAL meteorite name. Abbreviation: NWA 8556 Observed fall: No Year found: 2013 Country: (Northwest Africa) Mass: 110 g | ||||||||||||||||||||||
Classification history: |
This is 1 of 603 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||
Comments: | Approved 18 Oct 2014 | ||||||||||||||||||||||
Writeup |
Writeup from MB 103:
Northwest Africa 8556 (NWA 8556) (Northwest Africa) Purchased: 2013 Classification: HED achondrite (Eucrite) History: Purchased by Brahim Tahiri from a Moroccan hunter and sent to his partner Sean Tutorow for classification, April, 2013. Physical characteristics: Single stone. Dark irregular weathered exterior. Saw cut reveals a fine grained, light-gray basaltic texture with some shock melt veins. Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows pyroxene up to 500 μm, some with fine exsolution lamellae, plagioclase laths, shock melt veins, and calcite weathering veins. Ubiquitous troilite, ilmenite, and silica. Moderate weathering. Geochemistry: (C. Agee and N. Muttik, UNM) Low-Ca pyroxene Fs57.1±0.8Wo1.8±0.2, Fe/Mn=34±1, n=15; high-Ca pyroxene Fs33.3±13.0Wo32.6±15.1, Fe/Mn=33±2, n=7; plagioclase An83.7±0.7, n=4. Classification: Achondrite (eucrite) Specimens: 21.95 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass. | ||||||||||||||||||||||
Data from: MB103 Table 0 Line 0: |
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Institutions and collections |
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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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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Geography: |
Statistics: This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names) | ||||||||||||||||||||||
Also see: |
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Revision history: |
This lists important revisions made to data for this record.
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