Meteoritical Bulletin: Entry for Northwest Africa 2969

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Northwest Africa 2969

Basic information

Name: Northwest Africa 2969
This is an OFFICIAL meteorite name.
Abbreviation: NWA 2969
Observed fall: No
Year found: 2005
Country: (Northwest Africa)
Mass: 11.7 g

Classification
history:

Meteoritical Bulletin:	MB 91	(2007)	Martian (olivine-phyric shergottite)
Recommended:			Martian (shergottite) [explanation]

This is 1 of 321 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite). [show all]
Search for other: Martian meteorites

Comments:

Approved 1 Sep 2006

Writeup

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Writeup from MB 91:

Northwest Africa 2969

Northwest Africa

Find: August 2005

Achondrite (Martian olivine-phyric shergottite)

History and physical characteristics: A total mass of 11.7 g of several dozen very small stones <15 mm in the longest dimension were collected in the general area where shergottites NWA 1068/1110/2373 were found.

Petrography: (T. Bunch and J. Wittke, NAU) Subangular to subrounded complete to partial stones with little or no fusion crust. Olivine phenocrysts (<1.5 mm in longest dimension) set in a fine-grained groundmass of pigeonite, maskelynite, chromite, Ti-magnetite, augite, chlorapatite, and sulfide. Minor phases include Zn-rich troilite, silica, pentlandite, and Cr-ulvöspinel.

Geochemistry: Olivine is zoned from cores of Fa_31.7 (FeO/ MnO = 50–54.5) to rims of Fa_50.3 (FeO/MnO = 54–57). Pigeonite is zoned from cores of Fs_36.3Wo_8.1 to rims Fs₄₄Wo_12.7 (FeO/MnO = 26). Augite (Fs_22.5Wo_28.4), maskelynite (An_53.1Or_2.2), chromite (Cr/(Cr+Al) = 0.87; Fe/(Fe+Mg)= 0.90).

Classification: Achondrite (Martian olivine-phyric shergottite). The overall texture, mineral content and compositions, together with the find site location, strongly suggest that these stones are paired with NWA 1068/1110/ 2373.

Type specimen: A 4.3 g sample is on deposit at NAU. Birdsell holds the main mass.

Data from:
  MB91
  Table 2
  Line 137:

Place of purchase:	Erfoud, Morocco
Date:	2005
Mass (g):	11.7
Pieces:	Many
Class:	Martian
Classifier:	T. Bunch and J. Wittke, NAU
Type spec mass (g):	4.3
Type spec location:	NAU
Main mass:	Birdsell

Institutions
and collections

NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
Birdsell: Arizona Skies Meteorites, P.O. Box 2412, Flagstaff, AZ 86003, United States; Website (private address)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)

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Photos:

Credit	Photos
Photos from the Encyclopedia of Meteorites:
Norbert Classen

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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Revision
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