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Northwest Africa 7910 | |||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 7910 This is an OFFICIAL meteorite name. Abbreviation: NWA 7910 Observed fall: No Year found: 2009 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 10 approved meteorites classified as Mesosiderite-B2. [show all] Search for other: Class B mesosiderites, Mesosiderites, and Metal-rich meteorites | ||||||||||||||||||||||||||||
Comments: | Approved 27 Jul 2013 | ||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 102:
Northwest Africa 7910 (NWA 7910) (Northwest Africa) Purchased: Sept 2009 Classification: Mesosiderite (group B2) History: A portion of the original sample was donated by Mr. Fred Olsen to Cascadia on June 29, 2010. Physical characteristics: The fully crusted individual is oriented with a relatively flat leading side and some radial flow lines. No rusting is evident in cut faces. Petrography: (A. Ruzicka and K. Farley, Cascadia) Thin-section examination shows a silicate-metal breccia with ~45-50% metal, ~10-15% troilite, and minor to moderately deformed mineral and lithic clasts dominated by low-Ca pyroxene and plagioclase set in a granoblastic matrix of pyroxene, plagioclase, and silica mineral. The largest lithic clast is a ~1-cm-diameter gabbro clast with low-Ca pyroxene, high-Ca pyroxene, plagioclase, and silica mineral. Metal is minimally weathered (grade W1). Geochemistry: (K. Farley and A. Ruzicka, Cascadia) Phase compositions vary somewhat between and within clasts: low-Ca pyroxene Wo3.9±0.7 Fs34.7±3.1 Fe/Mn =23.7±7.5 (N=297), plagioclase An92.8±2.7 Or0.5±0.8 (N=238) (atomic units). Pyroxene clasts, and grains within the gabbro clast, sometimes have FeO-poor rims. Classification: Stony-iron (mesosiderite). Textures and mineralogy suggest a group B mesosiderite of textural type 2, but the meteorite is unusually rich in troilite. Specimens: 20.6 g in two slices and a polished thin section are on deposit at Cascadia. Mr. Ronnie McKenzie holds the main mass. | ||||||||||||||||||||||||||||
Data from: MB102 Table 0 Line 0: |
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Institutions and collections |
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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Geography: |
Statistics: This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names) |