Meteoritical Bulletin: Entry for Northwest Africa 6871

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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: 119 g

Classification
history:

Meteoritical Bulletin:	MB 100	(2012)	Ureilite
Recommended:			Ureilite [explanation]

This is 1 of 660 approved meteorites classified as Ureilite. [show all]
Search for other: Achondrites, Ureilites

Comments:

Approved 31 Jan 2012

Writeup

help

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 Fa_19.4-20.0(CaO=0.3 wt.%, Cr₂O₃=0.7 wt.%), rims Fa_10.5; orthopyroxene Fs_12.6-13.7Wo_3.7-3.4.

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)

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Photos:

Credit	Photos
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 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
history:

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