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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:help 11.7 g
Classification
  history:
Meteoritical Bulletin:  MB 91  (2007)  Martian (olivine-phyric shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 191 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 1 Sep 2006
Writeuphelp
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 Fa31.7 (FeO/ MnO = 50–54.5) to rims of Fa50.3 (FeO/MnO = 54–57). Pigeonite is zoned from cores of Fs36.3Wo8.1 to rims Fs44Wo12.7 (FeO/MnO = 26). Augite (Fs22.5Wo28.4), maskelynite (An53.1Or2.2), 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)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Norbert Classen   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6877 approved meteorites from (Northwest Africa) (plus 2037 unapproved names)

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