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Northwest Africa 13256
Basic information Name: Northwest Africa 13256
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13256
Observed fall: No
Year found: 2019
Country: Western Sahara
Mass:help 3 kg
Classification
  history:
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 321 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 5 Apr 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13256 (NWA 13256)

Western Sahara

Find: 2019

Classification: Lunar meteorite (feldspathic breccia)

History: Purchased in 2019 by Matthew Stream from a meteorite dealer in Western Sahara.

Physical characteristics: Minor fusion crust exterior; interior contains a few visible weathering veins.

Petrography: (D. Sheikh, FSU) This sample is a feldspathic fragmental breccia containing sub-angular clasts and isolated mineral grains (up to 4 mm) set in a fine-grained matrix. Anorthitic plagioclase is the dominant phase, with minor phases including pigeonite, augite, low-ca pyroxene, maskelynite, olivine, and ilmenite.

Geochemistry: Olivine (Fa36.3.2±0.2, range Fa36.2-36.5, FeO/MnO=90±3, n=2), Low-Ca Pyroxene (Fs20.3±3.7Wo3.0±1.8, range Fs16.3-25.3Wo0.4-4.4, FeO/MnO=49±7, n=4), Pigeonite (Fs33.2±5.6 Wo11.5±3.2, range Fs24.9-38.6Wo7.5-16.7, FeO/MnO=48±7, n=7), Augite (Fs37.3±11.7Wo36.6±1.6, range Fs20.2-45.0Wo34.3-37.8, FeO/MnO=48±3, n=7), Plagioclase (An95.3±1.4Or0.2±0.1, range An92.1-97.5Or0.1-0.6, n=77).

Classification: Lunar (feldspathic fragmental breccia).

Specimens: 20.3 grams at UCLA; main mass with Matthew Stream.

Data from:
  MB109
  Table 0
  Line 0:
Date:2019
Mass (g):3000
Pieces:10
Class:Lunar (feldsp. breccia)
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):36.3.2±0.2
Ferrosilite (mol%):20.3±3.7, 33.2±5.6, 37.3±11.7
Wollastonite (mol%):3.0±1.8, 11.5±3.2, 36.6±1.6
Magnetic suscept.:3.11
Classifier:D. Sheikh, FSU
Type spec mass (g):20.3
Type spec location:UCLA
Main mass:Matthew Stream
Comments:Submitted by Daniel Sheikh
Institutions
   and collections		 UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
FRANK THOMPSON   
Public domain photographs:
Daniel Sheikh   
Geography:

Western Sahara
Coordinates:Unknown.

Statistics:
     This is 1 of 270 approved meteorites from Western Sahara (plus 20 unapproved names)

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