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Northwest Africa 1827
Basic information Name: Northwest Africa 1827
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 1827
Observed fall: No
Year found: 2003
Country: (Northwest Africa)
Mass:help 877 g
Meteoritical Bulletin:  MB 88  (2004)  Mesosiderite-C
MetBase:  v. 7.1  (2006)  Mesosiderite-C
Recommended:  Mesosiderite-C    [explanation]

This is 1 of 9 approved meteorites classified as Mesosiderite-C.   [show all]
Search for other: Class C mesosiderites, Mesosiderites, and Metal-rich meteorites
Writeup from MB 88:

 Northwest Africa 1827


Purchased 2003 June


A complete stony-iron meteorite (877 g) was purchased in Rissani by a Moroccan dealer for N. Oakes (Oakes) in 2003 June.  Classification and mineralogy (A. Irving and S. Kuehner, UWS and T. Bunch, NAU): Igneous texture, mostly medium-grained but with some large mineral clasts of orthopyroxene and plagioclase (commonly surrounded by metal-rich areas).  Predominantly orthopyroxene with about 10 vol% metal (5 wt% Ni), troilite, chromite, merrillite, and sparse, large anorthite clasts (An90.5Ab91Or0.4 to An95.1Ab4.6Or0.2).  Large orthopyroxene clasts are more magnesian (Fs16.2Wo0.8, FeO/MnO = 34.8) than the predominant medium-sized orthopyroxene grains (Fs22.5Wo2.1 to Fs27.3Wo2.2, FeO/MnO = 29.7-32.7).  Small elongate grains of a secondary Ca-Fe-rich phosphate mineral occur along fractures in merrillite grains, and probably are of terrestrial origin.  Although this sample resembles a “metal-rich diogenite” rather than a mesosiderite, comparative studies by T. Bunch (NAU) of this sample, NWA 1879 and similar material provided by A. Jambon (UPVI) and M. Farmer have demonstrated that all (with an estimated total weight of over 22 kg) are part of a large, heterogenous mesosiderite (tentatively assigned to class C) containing sparse eucritic and diogenitic clasts (Bunch et al., 2004).  Specimens: type specimen, 20 g, UWS, 1 g and one polished thin section, NAU; main mass, Oakes.

Data from:
  Table 4
  Line 40:
Place of purchase:Rissani
Date:P Jun 2003
Mass (g):877
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):21
Type spec location:20g UWS and 1g ASU
Main mass:Oakes
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
UPVI: Université Pierre et Marie Curie (Paris VI),Case 110, 4 Place Jussieu, 75005 Paris, France (institutional address; updated 5 Oct 2014)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Oakes: Nelson Oakes, Route 1, House 50C, Uniondale, PA 18470, United States; Website (private address)
References: Published in Meteoritical Bulletin, no. 88, MAPS 39, A215-A272 (2004)
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     This is 1 of 9368 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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