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Northwest Africa 1839 | |||||||||||||
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Basic information | Name: Northwest Africa 1839 This is an OFFICIAL meteorite name. Abbreviation: NWA 1839 Observed fall: No Year found: 2003 Country: (Northwest Africa) Mass: ![]() | ||||||||||||
Classification history: |
This is 1 of 30 approved meteorites classified as L7. [show all] Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||
Writeup![]() |
Writeup from MB 89:
Northwest Africa 1839 Morocco Found 2003 Ordinary chondrite (L7) A 121.8 g, partially crusted stone was purchased in Rissani, Morocco in June 2003. Description and classification (T. Bunch and J. Wittke, NAU): The meteorite contains polygonal, equigranular (~1 mm grain size) crystals; no relict chondrules; prominent twinning in plagioclase. Mineral modes: orthopyroxene, 37 vol. %; olivine, 35 %; plagioclase, 12 %; Ca-rich pyroxene, 6 %; troilite, 4.5 %; metal (taenite only), 3.5 %; chromite, 2 %. Very homogeneous; silicate compositional range is within the analytical precision of ± 0.2 mol %. Orthopyroxene, Fs19.1Wo1.3, Fe/Mn = 41; olivine, Fa22.0, Fe/Mn = 63 plagioclase, An53.4Or2.2; clinopyroxene, Fs7.2Wo47; taenite, Ni = 16 .7 wt %; chromite, Cr/(Cr+Al) = 0. 73. Shock level, S1; weathering grade is W2. Specimens: 20.1 g, NAU; main mass, Oakes. | ||||||||||||
Data from: MB89 Table 7 Line 28: |
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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) Oakes: Nelson Oakes, Route 1, House 50C, Uniondale, PA 18470, United States; Website (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 89, MAPS 40, A201-A263 (2005)
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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) |