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Northwest Africa 1242 | |||||||||||||||||||||||||||||||
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Basic information | Name: Northwest Africa 1242 This is an OFFICIAL meteorite name. Abbreviation: NWA 1242 Observed fall: No Year found: 1985 Country: (Northwest Africa) Mass: ![]() | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 6 approved meteorites classified as Mesosiderite-A2. [show all] Search for other: Class A mesosiderites, Mesosiderites, and Metal-rich meteorites | ||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 86:
Northwest Africa 1242 Gillio, Libya Found 1985 Mesosiderite Two fully ablated pieces of a mesosiderite (total known weight ~7 kg) were found near the village of Gillio by unknown oil exploration workers and put into service as bookends for 13 years. Purchased in 1998 by an anonymous dealer. Reports of a strewn field are presently unconfirmed. Classification and mineralogy (T. Bunch and J. Wittke, NAU): type 2A; contains scarce, metal nodules up to 19 mm in diameter; Mg-rich pyroxene overgrowths on Ca-pyroxene clasts; moderate resorption of plagioclase. Orthopyroxene (Fs33Wo3) replaces pigeonite (Fs34Wo8) and exsolved augite (Fs43Wo42); plagioclase (An92); pyrrhotite, chromite (Al2O3 = 8.4 wt%); kamacite, 5.8 wt% Ni; rare taenite (42 wt% Ni), silica and phosphate. Shock stage, S1; weathering grade, W0. Specimens: type specimen, 20.2 g thin section, NAU; main mass is with the anonymous purchaser. | ||||||||||||||||||||||||||||||
Data from: MB86 Table 6 Line 157: |
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Institutions and collections |
NAU: Geology, Bldg 12
Knoles Dr
Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 86, MAPS 37, A157-A184 (2002)
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Photos: |
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Geography: |
Statistics: This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names) | ||||||||||||||||||||||||||||||
Synonyms![]() |
Sahara 85001 (D. Weir, pers. comm. 2009) |