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Northwest Africa 1925
Basic information Name: Northwest Africa 1925
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 1925
Observed fall: No
Year found: 2002
Country: (Northwest Africa)
Mass:help 86 g
Meteoritical Bulletin:  MB 88  (2004)  Eucrite
MetBase:  v. 7.1  (2006)  Eucrite
Recommended:  Eucrite    [explanation]

This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeup from MB 88:

Northwest Africa 1925


Found 2001

Achondrite (eucrite)

A single, 86 g, complete stone was purchased in Tagounite in 2002 April. Classification and mineralogy (T. Bunch and J. Wittke, NAU): gabbroic, cumulate eucrite; tabular crystals of plagioclase (<4 mm in longest dimension) poikilitically enclosed by large pyroxenes (up to 8 mm). Plagioclase is An91 with melt inclusions of a silica polymorph, Mg-augite, and ilmenite. Complex pyroxenes consist of inverted pigeonite (Fs52.5Wo4.2) with broad (5-8 µm) augite exsolution lamellae (Fs25Wo41) parallel to (100) of the host opx and blebs of augite that exsolved prior to or during pigeonite inversion. In additon, relic patches of pigeonite contain fine augite lamellae parallel to (001). Chromite, Cr/Cr+Al = 63-73, pyrrhotite, and tiny inclusions in opx of Ni-poor metal (Ni = 0.48 wt%; Co = 2.28 %) are also present. No ilmenite or silica was found outside of melt inclusions. Shock level, S2/3; weathering grade, W1.  Specimens: type specimen, 17.2 g, NAU; main mass, MFarmer.

Data from:
  Table 4
  Line 82:
Place of purchase:Tagounite
Date:P Apr 2002
Mass (g):86
Classifier:T. Bunch and J. Wittke, NAU
Type spec mass (g):17.2
Type spec location:ASU
Main mass:MFarmer
   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)
MFarmer: Michael Farmer, P.O. Box 86059, Tucson, AZ 85754-6059, 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 8890 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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