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Northwest Africa 6448
Basic information Name: Northwest Africa 6448
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6448
Observed fall: No
Year found: 2010
Country: (Northwest Africa)
Mass:help 44.7 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Winonaite
Recommended:  Winonaite    [explanation]

This is 1 of 35 approved meteorites classified as Winonaite.   [show all]
Search for other: Primitive achondrites, Winonaites
Comments: Approved 24 Jan 2012
Writeuphelp
Writeup from MB 100:

Northwest Africa 6448 (NWA 6448)

(Northwest Africa)

Purchased: 2010 June

Classification: Primitive achondrite (Winonaite)

History: Purchased by F. Kuntz at the St. Marie Show in June 2010.

Petrography: Metamorphic texture (grainsize 0.1-0.2 mm, with a few grains to 1 mm); triple junction grain boundaries are prevalent. Aggregate of olivine, orthopyroxene, clinopyroxene, kamacite, troilite, pentlandite, sodic plagioclase, and chlorapatite.

Geochemistry: Olivine Fa4.7-4.9 with Fe/Mn=11, orthopyroxene Fs6.1-6.8Wo2.3-2.4 with Fe/Mn=8-10, clinopyroxene Fs2.6-2.8Wo45.5 with Fe/Mn=6, and plagioclase An14.7-14.8Or3.7-4.0. Oxygen isotopes (R. Tanaka, OkaU): analyses of acid-washed sub-samples by laser fluorination gave, respectively δ17O 2.167, 2.166; δ18O 5.134, 5.155; Δ17O -0.535, -0.547 per mil.

Classification: Winonaite

Data from:
  MB100
  Table 1
  Line 1384:
Place of purchase:St. Marie
Date:P 2010 June
Mass (g):44.7
Pieces:1
Class:Winonaite
Shock stage:low
Weathering grade:low
Fayalite (mol%):4.7-4.9
Ferrosilite (mol%):6.1-6.8
Wollastonite (mol%):2.3-2.4
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):9.06
Type spec location:FMNH
Main mass:FMNH
Comments:Submitted by P. Sipiera
Plots: O isotopes:  
Institutions
   and collections
FMNH: Department of Geology The Field Museum of Natural History 1400 South Lake Shore Drive Chicago, IL 60605-2496, USA, United States; Website (institutional address; updated 16 Nov 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)
OkaU: Institute for Study of the Earth's Interior, Okayama University, Misasa Tottori 682-0193, Japan (institutional address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Jim K   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6781 approved meteorites from (Northwest Africa) (plus 2061 unapproved names)

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