|
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: 444 g | ||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 336 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 | ||||||||||||||||||||||||||||||
Writeup |
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: |
|
||||||||||||||||||||||||||||||
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)
| ||||||||||||||||||||||||||||||
Geography: |
Statistics: This is 1 of 9699 approved meteorites from (Northwest Africa) (plus 1854 unapproved names) | ||||||||||||||||||||||||||||||
Also see: |
This lists the most popular meteorites among people who looked up this meteorite.
| ||||||||||||||||||||||||||||||
Revision history: |
This lists important revisions made to data for this record.
|