Meteoritical Bulletin: Entry for Northwest Africa 7195

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Northwest Africa 7195

Basic information

Name: Northwest Africa 7195
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7195
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass: 60.1 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 29 May 2012

Writeup

help

Writeup from MB 100:

Northwest Africa 7195 (NWA 7195)

(Northwest Africa)

Purchased: 2011 Jan

Classification: Ureilite

History: Purchased in January 2012 by Greg Hupé from a Moroccan dealer at the Tucson Gem and Mineral Show.

Physical characteristics: A single fresh, extremely hard, black stone weighing 60.1 g, which was very difficult to cut. Contains wispy shreds of fresh metal throughout.

Petrography: (A. Irving and S. Kuehner, UWS; T. Bunch, NAU) Composed of fairly large grains of olivine and low-Ca pyroxene with interstitial narrow metal-rich zones. Both olivine and pyroxene are completely recrystallized to aggregates of tiny polygonal subgrains.

Geochemistry: Olivine cores Fa_18.3-18.6(CaO=0.2 wt.%, Cr₂O₃=0.4 wt.%), rims Fa_2.0-6.9; orthopyroxene Fs_14.6Wo_0.4; pigeonite Fs_7.0Wo_10.2, Fs_6.5Wo_21.8.

Classification: Achondrite (ureilite). The complete recrystallization of silicates is unusual among ureilites, and places this specimen with other very highly shocked ureilites such as NWA 6871.

Specimens: 12.1 g and one thin section are on deposit at UWS. GHupé holds the main mass.

Data from:
  MB100
  Table 1
  Line 1665:

Place of purchase:	Tucson
Date:	P 2011 Jan
Mass (g):	60.1
Pieces:	1
Class:	Ureilite
Shock stage:	high
Weathering grade:	low
Fayalite (mol%):	18.3
Ferrosilite (mol%):	14.6; 7.0-6.5
Wollastonite (mol%):	0.4; 10.2-21.8
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	12.1
Type spec location:	UWS
Main mass:	GHupé
Comments:	Submitted by A. Irving

Institutions
and collections

NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
GHupé: Gregory M. Hupé, 9003 Placid Lakes Blvd., Lake Placid, FL 33852, United States; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)

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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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