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Northwest Africa 12893
Basic information Name: Northwest Africa 12893
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12893
Observed fall: No
Year found: 2018
Country: Mauritania
Mass:help 56.1 g
Classification
  history:
Recommended:  L6-melt breccia    [explanation]

This is 1 of 48 approved meteorites classified as L6-melt breccia.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 11 Oct 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12893 (NWA 12893)

Mauritania

Purchased: 2018

Classification: Ordinary chondrite (L6, melt breccia)

History: Purchased online in 2018 by Daniel Sheikh from Matthew Stream, who had purchased it in 2017 from a seller in Mauritania.

Physical characteristics: Single stone with dark-brown fusion crust. Interior slice reveals brecciated texture.

Petrography: (Daniel Sheikh, FSU) Sample is a breccia composed of angular clasts (up to 2.5 cm) set in a shock melted matrix. Major phases present include olivine, low-ca pyroxene, high-ca pyroxene, sodic plagioclase (Av. 60 μm), kamacite, taenite, and troilite. Accessory chromite is present as well. A few of the clasts contain relict chondrule (BO and RP) fragments.

Geochemistry: (Daniel Sheikh, FSU) Olivine (Fa24.8±0.6, n=87), low-Ca Pyroxene (Fs21.1±0.6Wo1.4±0.2, n=48), high-Ca Pyroxene (Fs8.5±0.7Wo43.7±0.7, n=11), Sodic Plagioclase (An11.3±0.6, n=43), Chromite (Cr/(Cr+Al)=85.5±0.2, n=4).

Classification: Ordinary chondrite (L6-melt breccia)

Specimens: 16.83 grams at UCLA; main mass with Daniel Sheikh.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2018
Mass (g):56.05
Pieces:1
Class:L6-melt breccia
Shock stage:S3
Weathering grade:W2
Fayalite (mol%):24.8±0.6
Ferrosilite (mol%):21.1±0.6, 8.5±0.7
Wollastonite (mol%):1.4±0.2, 43.7±0.7
Classifier:D. Sheikh, FSU
Type spec mass (g):16.83
Type spec location:UCLA
Main mass:Daniel Sheikh
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. 108, in preparation (2019)
Find references in NASA ADS:
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Photos:
CreditPhotos
Public domain photographs:
Daniel Sheikh   
Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 127 approved meteorites from Mauritania (plus 1 unapproved name) (plus 2 impact craters)

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