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Northwest Africa 7281 | |||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 7281 This is an OFFICIAL meteorite name. Abbreviation: NWA 7281 Observed fall: No Year found: 2012 Country: Morocco Mass: 20 g | ||||||||||||||||||||||||
Classification history: |
This is 1 of 598 approved meteorites (plus 1 unapproved name) classified as Eucrite. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||
Comments: | Approved 17 Jul 2012 | ||||||||||||||||||||||||
Writeup |
Writeup from MB 101:
Northwest Africa 7281 (NWA 7281) Morocco Purchased: 2012 Jan 12 Classification: HED achondrite (Eucrite) History: Purchased by Sean Tutorow in Morocco, January 12, 2012. Physical characteristics: Single stone, no fusion crust, saw cut reveals breccia with numerous light-colored clasts or phenocrysts up to 5 mm, set in a light-gray groundmass. Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows approximately 60% pyroxene, 30% plagioclase, ubiquitous silica, ilmenite, and troilite. Many pyroxenes show exsolution lamellae. Silicate shock melt veins and pockets throughout, some cataclastic zones present. Geochemistry: (C. Agee and N. Wilson, UNM) EMPA. Low Ca-pyroxene Fs60.7±0.9Wo3.0±1.0, Fe/Mn=32±1 (at.%) n=4; pigeonite Fs50.9±0.6Wo15.3±0.8, Fe/Mn=30±2, n=2; augite Fs27.3±1.0Wo43.1±0.9, Fe/Mn=31±1, n=6; plagioclase Or0.5±0.1Ab9.9±0.3An89.6±0.4, n=4. Silicate melt SiO2=49.41±0.73, Al2O3=18.03±1.32, TiO2=0.74±0.19, CaO/Al2O3=0.68±0.03 FeO/MnO=34±2 (wt%) n=8. Classification: Equilibrated, brecciated eucrite. Minor weathering. Specimens: 4.5 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass. | ||||||||||||||||||||||||
Data from: MB101 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. 101, MAPS 50, 1661, September 2015
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Geography: |
Statistics: This is 1 of 2082 approved meteorites from Morocco (plus 31 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||
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Revision history: |
This lists important revisions made to data for this record.
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