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Northwest Africa 6871
Basic information Name: Northwest Africa 6871
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6871
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 119 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 516 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 31 Jan 2012
Writeuphelp
Writeup from MB 100:

Northwest Africa 6871 (NWA 6871)

(Northwest Africa)

Purchased: April 2011

Classification: Ureilite

History: Purchased in 2011 April by Greg Catterton from a Moroccan dealer in Agadir.

Physical characteristics: A single extremely hard, brown stone weighing 119 g and almost impossible to cut. Small adamantine crystals of diamond were extracted from the stone by Mr. Catterton.

Petrography: Coarse-grained aggregate of olivine and orthopyroxene with finer grained interstitial regions containing opaque material, calcite and limonite. Some thin calcite veinlets cross-cut the specimen. Both olivine and pyroxene are completely recrystallized to aggregates of myriad tiny, polygonal subgrains.

Geochemistry: Olivine cores Fa19.4-20.0 (CaO=0.3 wt.%, Cr2O3=0.7 wt.%), rims Fa10.5; orthopyroxene Fs12.6-13.7Wo3.7-3.4.

Classification: Achondrite (ureilite). The very high shock experienced by this specimen (causing complete recrystallization of silicates and evidently generation of significant amounts of microdiamond) is unusual among ureilites.

Specimens: A total of 20 g of material is on deposit at App and one polished thin section is at UWS. Mr. G. Catterton holds the main mass.

Data from:
  MB100
  Table 1
  Line 1521:
Place of purchase:Agadir
Date:P April 2011
Mass (g):119
Pieces:1
Class:Ureilite
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):19.4-20.0; 10.5
Ferrosilite (mol%):12.6-13.7
Wollastonite (mol%):3.7-3.4
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):20
Type spec location:UWS
Main mass:G. Catterton
Comments:Submitted by A. Irving
Institutions
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
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 7035 approved meteorites from (Northwest Africa) (plus 2000 unapproved names)

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