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Northwest Africa 5349
Basic information Name: Northwest Africa 5349
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 5349
Observed fall: No
Year found: 2008
Country: (Northwest Africa)
Mass:help 445 g
Classification
  history:
Meteoritical Bulletin:  MB 99  (2011)  Polymict eucrite
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 341 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 1 Oct 2010
Writeuphelp
Writeup from MB 99:

Northwest Africa 5349 (NWA 5349)

(Northwest Africa)

Purchased: Jan 2008

Classification: HED achondrite (Eucrite, polymict)

History: The main mass holder purchased the sample in Zagora, Morocco.

Physical characteristics: This meteorite consists of a single stone weighing 445 g. Dark fusion crust covers one rounded side, while the other side is an irregular broken surface. Light-colored (white, beige) and black inclusions set in a dark gray matrix are visible in both the broken exterior and cut interior surfaces.

Petrography: (Melinda Hutson and Alex Ruzicka, Cascadia). In thin section, this meteorite shows lithic and mineral clasts which vary in size and texture set in a groundmass of angular grains. The three largest clasts (3-5 mm) are basaltic with mineral grains and clasts set in a granular matrix. Smaller clasts are mainly basaltic with textures varying from granular to subophitic. Large low-Ca pyroxene mineral clasts that comprise a diogenitic component are present and make up less than 10% of the section. Large feldspar mineral clasts (0.2-1 mm) are present. These feldspar clasts display a variety of textures, including triple junctions, clear twinned feldspar intergrown with cloudy feldspar, grains displaying mosaic extinction, and twinned feldspars with microfaults. No maskelynite was observed, but notable shock effects in low-Ca pyroxene (mosaic extinction) and plagioclase (recrystallization) are evident. Six clasts larger than 0.1 mm are largely opaque in transmitted light and contain silicate subclasts as well as many tiny oxide and sulfide inclusions (droplets and veins). A silicate vein containing small rounded opaques is interpreted as a shock vein. A couple of metal grains with minor oxide rims (weathering products) were observed.

Geochemistry: (Melinda Hutson and Alex Ruzicka, Cascadia; Ilya Bindeman, UOr). EMPA analyses: Mg-rich low-Ca pyroxene (Wo1.6-5.3 En60.5-78.1 Fs20.0-36.8) Fe/Mn = 29.9 ± 1.8; intermediate low-Ca pyroxene (Wo1.0-4.0 En49.3-55.4 Fs41.0-48.8) Fe/Mn = 32.1±0.8; Fe-rich low-Ca pyroxene (Wo1.6-4.7 En30.0-40.6 Fs55.9-66.0) Fe/Mn = 31.1±0.8; pigeonite (Wo5.6-19.1 En31.3-48.4 Fs41.0-60.6) Fe/Mn = 31.7±1.3; and augite (Wo42.1-43.5 En28.0-30.1 Fs27.9-29.4) Fe/Mn = 34.1±2.5; plagioclase (An88.4±2.7, Ab11.3±2.5, n=33). Oxygen isotopes (whole rock): δ18O = 3.80±0.03 ‰, δ17O = 1.73±0.06 ‰, and Δ17O = -0.264±0.045 ‰ .

Classification: Achondrite (polymict eucrite). Minimal weathering and moderate shock.

Specimens: 21 g and one thin section are on deposit at Cascadia. Thompson holds the main mass.

Data from:
  MB99
  Table 0
  Line 0:
Place of purchase:Zagora, Morocco
Date:P Jan 2008
Mass (g):445
Pieces:1
Class:Polymict eucrite
Ferrosilite (mol%):20.0-66.0
Wollastonite (mol%):1.0-5.3
Classifier:Melinda Hutson, Alex Ruzicka
Type spec mass (g):21
Type spec location:Cascadia
Main mass:Thompson
Comments:Submitted by Melinda Hutson
Plots: O isotopes:  
Institutions
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address)
UOr: Department of Geological Sciences, 1272 University of Oregon, Eugene, OR 97403, United States (institutional address; updated 1 Oct 2010)
Catalogs:
References: Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6968 approved meteorites from (Northwest Africa) (plus 2012 unapproved names)

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