Meteoritical Bulletin: Entry for Northwest Africa 7906

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Northwest Africa 7906

Basic information

Name: Northwest Africa 7906
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7906
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass: 47.7 g

Classification
history:

Meteoritical Bulletin:	MB 102	(2013)	Martian (basaltic breccia)
	MB 107	(2018)	Martian (polymict breccia)
Recommended:			Martian (polymict breccia) [explanation]

This is 1 of 18 approved meteorites classified as Martian (polymict breccia). [show all]
Search for other: Martian meteorites

Comments:

Approved 19 Jun 2013
Revised 16 Nov 2018: Updated class; see NWA 7034)

Writeup

help

Writeup from MB 102:

Northwest Africa 7906 (NWA 7906)

(Northwest Africa)

Purchased: Jan 2013

Classification: Martian meteorite (basaltic breccia)

History: Purchased in January 2013 by Marc Jost in Morocco.

Physical characteristics: Black 47.68 g stone with remnants of fusion crust. Light-colored clasts and spheroidal objects in a brecciated matrix.

Petrography: (B. Hofmann NMBE; N. Greber, Bern) Breccia of angular mineral grains (to 4 mm), lithic clasts and spheroidal objects (2-5 mm diameter) in fine-grained matrix. Minerals observed are pyroxenes, plagioclase,alkali feldspar, magnetite, chlorapatite, ilmenite, pyrite, maghemite, and goethite.

Geochemistry: Orthopyroxene (Fs_22-43Wo_2-4, FeO/MnO = 25-40; n = 15), pigeonite (Fs_30-50Wo_6-13, FeO/MnO = 30-42; n = 4), augite (Fs_31-51Wo_38-48, FeO/MnO = 22-42; n = 4), plagioclase (An_27-51Or_1.7-4.4; n = 15), alkali feldspar (An_1.1Or₈₇; n = 1). Bulk analysis (XRF, n=20) gives Fe/Mn (wt) = 45.7, Ca/Si = 0.23, Mg/Si = 0.21, Ni = 494 ppm, Cr = 1660 ppm. Oxygen isotopes: (R. Greenwood, OU) gave δ¹⁸O=6.28, δ¹⁷O=3.92, Δ¹⁷O= 0.62 (all per mil).

Classification: Martian (basaltic breccia). Closely resembles NWA 7034 and pairings and is very likely paired with these stones.

Specimens: 10.50 g and one polished thin section at NMBE. Remaining material is held by Marc Jost.

Data from:
  MB102
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P Jan 2013
Mass (g):	47.68
Pieces:	1
Class:	Martian (basaltic breccia)
Shock stage:	S2
Ferrosilite (mol%):	22-43
Wollastonite (mol%):	2-4
Classifier:	B. Hofmann NMBE; N. Greber, Bern
Type spec mass (g):	10.50
Type spec location:	NMBE
Main mass:	Marc Jost
Comments:	Submitted by Beda Hofmann

Plots:

O isotopes:

Institutions
and collections

NMBE: Natural History Museum Bern Bernastrasse 15 CH-3005 Bern Switzerland, Switzerland; Website (institutional address; updated 2 Mar 2012)
OU: Planetary and Space Sciences Department of Physical Sciences The Open University Walton Hall Milton Keynes MK7 6AA United Kingdom, United Kingdom (institutional address; updated 8 Dec 2011)
Bern: University of Bern, University of Bern, Hochschulstrasse 4, CH-3012 Bern, Switzerland (institutional address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 102, MAPS 50, 1662, September 2015

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Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

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Revision
history:

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