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Northwest Africa 1461
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:help 252 g
Meteoritical Bulletin:  MB 92  (2007)  Diogenite
Recommended:  Diogenite    [explanation]

This is 1 of 520 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 24 Jul 2007
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:
  Table 2
  Line 2:
Place of purchase:Erfoud, Morocco
Mass (g):252
Type spec mass (g):23+1.3
Plots: O isotopes:  
   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)
References: Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)
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     This is 1 of 9559 approved meteorites from (Northwest Africa) (plus 1872 unapproved names)

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