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Northwest Africa 13568
Basic information Name: Northwest Africa 13568
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13568
Observed fall: No
Year found: 2020
Country: Algeria
Mass:help 825 g
Classification
  history:
Recommended:  Lunar    [explanation]

This is 1 of 93 approved meteorites classified as Lunar.   [show all]
Search for other: Lunar meteorites
Comments: Approved 5 Dec 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13568 (NWA 13568)

Tindouf, Algeria

Purchased: 2020

Classification: Lunar meteorite

History: Many samples, associated with the main mass of 625 g, (total 825 g) were found in the vicinity of Tindouf, Algeria. All material was purchased by Adrián Contreras from a meteorite dealer in the area.

Physical characteristics: Samples are dark in color with light orange patches caliche and have blocky irregular shapes. The cut face shows the interior is a breccia of lithic and mineral clasts set dark gray matrix with regions of small vesicles.

Petrography: Description and classification (A. Love, App) Polymict breccia dominated by angular, irregularly shaped, 1 mm to 3 cm sized mineral, lithic and vitrified clasts set within a melt matrix composed of isotropic to partially devitrified translucent glass and angular mineral fragments. Gabbroic lithic clasts are dominant, fragmental clasts set in opaque glass. Additional minerals are: troilite, FeNi metal.

Geochemistry: (A. Love, App) Olivine, Fa26.0±7.1 (Fa18.0-37.0, Fe/Mn=81.5±7.1, n=11); low-Ca pyroxene, Fs29.4±11.8Wo3.3±0.8 (Fs17.1-48.8Wo2.4-4.8, Fe/Mn=52.9±4.9, n=21); pigeonite, Fs38.7±6.2Wo13.8±3.3 (Fs29.1-45.3Wo9.7-19.1, Fe/Mn=55.0±3.3, n=9); high-Ca pyroxene, Fs32.5±7.9Wo30.1±4.2(Fs22.3-41.0Wo21.8-34.2, Fe/Mn=54.7±5.1, n=6); plagioclase, An97.0±0.6Or0.0±0.10 (n=9).

Classification: Lunar (feldspathic breccia M-S3, low weathering). Based on textures, melt matrix component and mineral compositions, this sample is a feldspathic breccia.

Specimens: Adrián Contreras holds the 58 2 g main mass. A polished thin section and 2 slices and several fragments weighing 31.26 g are on deposit at App.

Data from:
  MB109
  Table 0
  Line 0:
State/Prov/County:Tindouf
Place of purchase:Tindouf, Algeria
Date:P 2020
Mass (g):825
Pieces:51
Class:Lunar
Shock stage:M-S3
Weathering grade:low
Fayalite (mol%):26.0±7.1
Ferrosilite (mol%):29.4±11.8; 38.7±6.2; 32.5±7.9
Wollastonite (mol%):3.3±0.8; 13.8±3.3; 30.1±4.2
Magnetic suscept.:2.98
Classifier:A. Love, App
Type spec mass (g):31.26
Type spec location:App
Main mass:Adrian Contreras
Comments:Submitted by Anthony Love
Institutions
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 38 approved meteorites from Tindouf, Algeria (plus 1 impact crater)
     This is 1 of 1088 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

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