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Northwest Africa 1461 | |||||||||||||
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Basic information | Name: Northwest Africa 1461 This is an OFFICIAL meteorite name. Abbreviation: NWA 1461 Observed fall: No Year found: 2002 Country: (Northwest Africa) Mass: ![]() | ||||||||||||
Classification history: |
This is 1 of 511 approved meteorites classified as Diogenite. [show all] Search for other: Achondrites, Diogenites, and HED achondrites | ||||||||||||
Comments: | Approved 24 Jul 2007 | ||||||||||||
Writeup![]() |
Writeup from MB 92:
Northwest Africa 1461 Algeria or Morocco Find: March 2002 Achondrite (diogenite) History: DGregory purchased the 252 g stone in Erfoud, Morocco in March 2002. Physical characteristics: A single pale gray-green, broken stone. Petrography: (A. Irving and S. Kuehner, UWS) Coarse grained (clasts up to 7 mm) with a partly cataclastic texture. Predominantly orthopyroxene (with diffuse grain boundaries) and accessory chromite. Minor calcite is present along some grain boundaries. Mineral compositions and geochemistry: Orthopyroxene (Fs13.5-13.7Wo0.7-0.9; FeO/MnO = 32.0-33.8). This specimen is distinctive in the magnesian pyroxene it exhibits. Oxygen Isotopes: (D. Rumble, CIW) Replicate analyses by laser fluorination yielded δ18O = 3.177, 3.584; δ17O = 1.410, 1.634; Δ17O = -0.2609, -0.2505 (all ‰). Classification: Achondrite (diogenite). Type specimens: A total of 23 g of sample is on deposit at UCLA. One polished thin section and 1.3 g are on deposit at UWS. DGregory holds the main mass. | ||||||||||||
Data from: MB92 Table 2 Line 2: |
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Plots: | O isotopes: | ||||||||||||
Institutions and collections |
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011) UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012) CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address) DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address) |
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Catalogs: |
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References: | Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)
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Geography: |
Statistics: This is 1 of 9111 approved meteorites from (Northwest Africa) (plus 1873 unapproved names) |