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Northwest Africa 1586
Basic information Name: Northwest Africa 1586
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 1586
Observed fall: No
Year found: 2002
Country: (Northwest Africa)
Mass:help 400 g
Meteoritical Bulletin:  MB 87  (2003)  Ureilite
MetBase:  v. 7.1  (2006)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 572 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Writeup from MB 87:

Northwest Africa 1586

Northwest Africa

Found 2002 June

Achondrite (ureilite)

A 400 g stone was collected by nomads in the Sahara and later on purchased from a dealer in Morocco. Classification and mineralogy (S. Singletary, MIT): typical monomict ureilite texture with abundant triple junctions and curved intergranular boundaries. Grain sizes are 1–2 mm on average. Mineral modes are 75% olivine, 25% pyroxene. Homogeneous olivine cores (Fo79, n = 61) have reduction rims that contain finely dispersed grains of metal and olivine (Fo97). The predominant pyroxene is pigeonite with mg# of 80 and Wo11 (n = 103). Pigeonite grains have “swaths” (melt veins?) that contain a metal and three-pyroxene assemblage consisting of augite (mg# 90, Wo32, n = 17), orthopyroxene (mg# 86, Wo5, n = 8) and pigeonite (mg# 86, Wo9, n = 6). Specimens: main mass, Bessey; type specimen, 21.9 g, and one thin section, TCU.

Data from:
  Table 8
  Line 184:
Place of purchase:Morocco
Date:P Jun 2002
Mass (g):400
Classifier:S. Singletary, MIT
Type spec mass (g):21.9
Type spec location:TCU
Main mass:Bessey
   and collections
TCU: Oscar E. Monnig Collection, Department of Geology, Texas Christian University, Ft. Worth, TX 76129, United States; Website (institutional address; updated 24 Feb 2012)
Bessey: Dean Bessey ,P.O. Box 40810, Glenfield, Auckland 1310 , New Zealand; Website (private address)
MIT: Department of Earth and Planetary Sciences, 54-1224, Massachusetts Institute of Technology, Cambridge, MA 02139, United States (institutional address)
Search for this meteorite in the Natural History Museum collection (U.K.):   
    Require NHM photo
References: Published in Meteoritical Bulletin, no. 87, MAPS 38, A189-A248 (2003)
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     This is 1 of 7688 approved meteorites from (Northwest Africa) (plus 1972 unapproved names)

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