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Northwest Africa 1644
Basic information Name: Northwest Africa 1644
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 1644
Observed fall: No
Year found: 2001
Country: (Northwest Africa)
Mass:help 214 g
Meteoritical Bulletin:  MB 87  (2003)  Eucrite-pmict
MetBase:  v. 7.1  (2006)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 424 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeup from MB 87:

Northwest Africa 1644


Purchased 2001 spring

Achondrite (eucrite, polymict)

A mass of 214 g was purchased by Bessey from a dealer in Morocco. Mineralogy and classification (S. Singletary, MIT): brecciated texture with several large lithic and mineral clasts in a fragmental matrix. The clasts resemble diogenites, cumulate and basaltic eucrites in mineral composition and texture. Medium-grained cumulate eucrite clasts of ophitic texture consist of plagioclase (An91–94) and pigeonite (Wo5–10, En37–52), minor orthopyroxene (Wo3, En53) and Ti-rich chromite. Basaltic eucrite clasts with a sub-ophitic texture contain extremely iron-rich augite (possibly pyroxferroite; Wo16–31, En3–8), plagioclase (An82–87), a silica phase and Ti­rich chromite. Sparse (<5 vol%) diogenitic clasts consist of orthopyroxene (Wo2–5). Pyroxene Fe/Mn ranges from 27–33. The possible pyroxferroite grains have Fe/Mn 27–45. Matrix is pyroxene (pigeonite, augite, and orthopyroxene), minor olivine, Fe-rich sulfides, Ti-rich chromite and rare spherules of glass; one zircon grain was observed; one symplectitic grain composed of silica, augite and fayalite is interpreted to be the result of pyroxferroite breakdown. Specimens, type specimen, 20 g, TCU; main mass, Bessey.

Data from:
  Table 8
  Line 209:
Date:P 2001
Mass (g):214
Class:Euc pm
Classifier:S. Singletary, MIT
Type spec mass (g):20
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)
References: Published in Meteoritical Bulletin, no. 87, MAPS 38, A189-A248 (2003)
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Photos from the Encyclopedia of Meteorites:
Don Edwards   
Shinishi Kato   

     This is 1 of 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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