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Northwest Africa 739
Basic information Name: Northwest Africa 739
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 739
Observed fall: No
Year found: 1999
Country: (Northwest Africa)
Mass:help 60 g
NHM Catalogue:  5th Edition  (2000)  CH
Meteoritical Bulletin:  MB 86  (2002)  CH
MetBase:  v. 7.1  (2006)  CH3
Recommended:  CH3    [explanation]

This is 1 of 28 approved meteorites classified as CH3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CH chondrites, CH-CB family, and Metal-rich meteorites
Writeup from MB 86:

Northwest Africa 739


Purchased 2000 January

Carbonaceous chondrite (CH)

Two stones that fit together, with a total mass of 60 g, were purchased by DGregory from a Moroccan dealer at the Tucson mineral show at the end of 2000 January.  The fusion crust is black. Mineralogy and classification (R. Jones, UNM): metal-rich chondrite with small chondrules, average chondrule size 87 µm. Cryptocrystalline chondrules are common in smaller size range. Most olivine and pyroxene have Fe/(Fe + Mg) < 6 mol%, with peaks at Fa2–3 and Fs3 in histograms of random analyses. Olivine and pyroxene compositions range up to Fa23 and Fs24. CAIs are small (mostly <60 µm) and a variety of types including grossite-rich. Metal constitutes ~10 vol% of the chondrite and is mostly kamacite, mean Ni = 6.5 wt%, with solar Ni/Co ratio. Oxygen isotopes (Z. Sharp and T. Larson, UNM): δ18O = +4.32‰, δ17O = +1.75‰. Chondrite has affinities to the CH group, in particular Acfer 182. Specimens: type specimen, 12 g, and thin section, UNM; main mass, ROM.

Data from:
  Table 6
  Line 24:
Origin or pseudonym:Lahmada
Date:P 1 Nov 1999
Mass (g):60
Plots: O isotopes:  
   and collections
ROM: Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario M5S 2C6, Canada (institutional address; updated 18 Oct 2011)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
DGregory: David Gregory, 230 First Avenue, Suite 108, St. Thomas, Ontario N5R 4P5, Canada (private address)
References: Published in Meteoritical Bulletin, no. 86, MAPS 37, A157-A184 (2002)
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     This is 1 of 9559 approved meteorites from (Northwest Africa) (plus 1872 unapproved names)

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