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Northwest Africa 13642
Basic information Name: Northwest Africa 13642
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13642
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 169 g
Recommended:  Ureilite    [explanation]

This is 1 of 604 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 10 Jan 2021
Writeup from MB 110:

Northwest Africa 13642 (NWA 13642)

(Northwest Africa)

Purchased: 2020

Classification: Ureilite

History: Purchased in January 2020 by Yang Shun-Chung from Naji Lahbib in Guelmim, Morocco.

Physical characteristics: Single stone with weathered fusion crust.

Petrography: (D. Sheikh, FSU) Specimen displays a coarse-grained cumulate texture (Av. 2 mm, up to 3 mm) composed primarily of olivine (some contain melt inclusions) and pigeonite (some are twinned). Most olivine and a few pigeonite grains display reduced rims in contact with either graphite or Fe-Ni metal. Some kamacite and troilite grains have been weathered to form Fe-oxides, some dispersed as veins throughout the specimen.

Geochemistry: Olivine (Fa7.6±2.8, range Fa1.2-10.7, Cr2O3=0.6±0.1 wt%, CaO=0.3±0.1 wt%, n=34), Pigeonite (Fs9.1±1.2Wo9.1±0.4, range Fs3.1-9.9Wo7.5-9.8, Cr2O3=0.9±0.1 wt%, Al2O3=0.7±0.1 wt%, n=33).

Classification: Ureilite

Specimens: 20.2 grams at UCLA; main mass with Yang Shun-Chung.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020
Mass (g):169
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):7.6±2.8
Ferrosilite (mol%):9.1±1.2
Wollastonite (mol%):9.1±0.4
Classifier:D. Sheikh, FSU
Type spec mass (g):20.2
Type spec location:UCLA
Main mass:Yang Shun-Chung
Comments:Submitted by Daniel Sheikh
   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)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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     This is 1 of 8402 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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