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Northwest Africa 7022
Basic information Name: Northwest Africa 7022
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 7022
Observed fall: No
Year found: 2011
Country: (Northwest Africa)
Mass:help 444 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Lunar (feldsp. breccia) 
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 181 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 16 Dec 2011
Revised 29 Jan 2012: Revised mass
Writeuphelp
Writeup from MB 100:

Northwest Africa 7022 (NWA 7022)

(Northwest Africa)

Purchased: 2011 Mar

Classification: Lunar meteorite (feldspathic breccia)

History: Reported to be found near Tandouf, Algeria, in February 2011, and purchased from a dealer in Zagora, Morocco by Peter Utas in March 2011.

Physical characteristics: A single stone (444 g) with partial fusion crust. About two-thirds of the stone consists of a fragmental breccia composed of a variety of lighter colored, mostly angular mineral and rock clasts in a dark-gray matrix. The other one-third of the stone is comprised of a single large (to 4 cm), light-gray, fine-grained clast (which itself contains small remnant clasts).

Petrography: (A. Irving and S. Kuehner, UWS) The large, light-gray clast contains sparsely-distributed angular grains of olivine and calcic plagioclase set in a melt-textured (intersertal) aggregate of calcic plagioclase and both low-Ca and high-Ca pyroxenes, with accessory skeletal ilmenite, armalcolite, fayalite, troilite, silica polymorph, baddeleyite, merrillite, kamacite and rare zircon. The complex dark matrix portion consists of angular grains of olivine, low-Ca pyroxene, calcic plagioclase, Ti-bearing chromite, silica polymorph, silica+K-feldspar intergrowths, kamacite, feldspar-rich clasts (including additional melt-textured clasts), and sparse glass fragments containing tiny vesicles.

Geochemistry: Olivine (Fa40.6-47.6, Fe/Mn=114-117), low-Ca pyroxene (Fs22.8-28.8Wo5.9-6.5, Fe/Mn=52-61), high-Ca pyroxene (Fs26.4-28.8Wo22.2-18.3, Fe/Mn=58-74), plagioclase (An91.5-94.8Or0.4-0.2).

Classification: Achondrite (lunar, feldspathic breccia). Terrestrial weathering is minimal.

Specimens: A total of 21.6 g of sample is on deposit at UWS. The main mass is held by Peter Utas.

Data from:
  MB100
  Table 1
  Line 1579:
Place of purchase:Zagora
Date:P 2011 Mar
Mass (g):444
Pieces:1
Class:Lunar (feldsp. breccia)
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):40.6-47.6
Ferrosilite (mol%):22.8-28.8; 26.4-28.8
Wollastonite (mol%):5.9-6.5; 22.2-18.3
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):21.6
Type spec location:UWS
Main mass:P. Utas
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7005 approved meteorites from (Northwest Africa) (plus 2002 unapproved names)

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