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Northwest Africa 5774
Basic information Name: Northwest Africa 5774
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 5774
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass:help 34 g
Meteoritical Bulletin:  MB 102  (2013)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 400 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 10 Dec 2013
Writeup from MB 102:

Northwest Africa 5774 (NWA 5774)

(Northwest Africa)

Purchased: 2005 Jun

Classification: HED achondrite (Eucrite, polymict)

History: Purchased by F. Kuntz in June 2005 from a dealer in Morocco.

Petrography: (A. Irving and S. Kuehner) Fresh fragmental breccia composed mainly of gabbroic eucrite clasts and related crystalline debris, plus ~5 vol.% orthopyroxene grains derived from diogenites. The eucrite material consists of exsolved pigeonite, calcic plagioclase,silica polymorph, subcalcic ferroaugite, fayalite, ferrosilite, symplectititc intergrowths of fayalite+hedenbergite+silcia, ilmenite, Ti-poor chromite, Ti-rich chromite and troilite.

Geochemistry: Olivine (Fa77.1, FeO/MnO = 44.6), diogenitic orthopyroxene (Fs26.1Wo3.9, FeO/MnO = 31), pigeonite (Fs36.6Wo6.0; Fs53.3Wo10.1; FeO/Mn) = 29-30), subcalcic ferroaugite (Fs64.4Wo28.7, FeO/MnO = 37), low-Ca pyroxene host (Fs54.8Wo8.4, FeO/MnO = 31), clinopyroxene exsolution lamella (Fs31.0Wo39.0, FeO/MnO = 31).

Classification: Eucrite (polymict).

Specimens: Type specimen plus one polished thin section at PSF; main mass with Kuntz.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2005 Jun
Mass (g):34
Shock stage:low
Weathering grade:low
Fayalite (mol%):77.1
Ferrosilite (mol%):36.6-53.3
Wollastonite (mol%):6.0-10.1
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):7.5
Type spec location:PSF
Main mass:F. Kuntz
Comments:K117; submitted by P. Sipiera
   and collections
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Kuntz: Fabien Kuntz, France; Website (private address)
References: Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015
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     This is 1 of 9370 approved meteorites from (Northwest Africa) (plus 1875 unapproved names)

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