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Northwest Africa 13742
Basic information Name: Northwest Africa 13742
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13742
Observed fall: No
Year found: 2020
Country: Mauritania
Mass:help 272 g
Classification
  history:
Recommended:  eucrite    [explanation]

This is 1 of 569 approved meteorites (plus 1 unapproved name) classified as eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 21 Feb 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13742 (NWA 13742)

Mauritania

Purchased: 2020

Classification: HED achondrite (Eucrite)

History: Thirty-four samples with a TKW of 271.6 g were found in December 2020 by anonymous prospectors in Mauritania. John Higgins purchased the samples from a Mauritanian meteorite dealer in 2020.

Physical characteristics: Samples are irregularly shaped and have a dark exterior lacking fusion crust. Some samples contain small holes that may represent vesicles. The cut face shows the interior is composed of abundant light-colored crystalline clasts set in a dark matrix.

Petrography: Description and classification (A. Love, App) Sample is a breccia composed of mm-sized angular, basaltic-textured clasts set within a comminuted matrix of related debris. Pyroxenes are exsolved and both pyroxene and plagioclase show clouding by opaques and other phases. Additional minerals are: ilmenite, chromite, a silica polymorph, phosphates and terrestrial barite.

Geochemistry: low Ca pyroxene (Fs64.1±1.0Wo2.6±0.7, Fe/Mn=30.5±1.1, Mg#=34.2±0.6, n=12); high Ca pyroxene (Fs29.1±1.7Wo42.6±2.0, Fe/Mn=31.9±1.0, n=12); plagioclase (An91.9±0.7Or0.4±0.1, n=9).

Classification: HED achondrite (eucrite). Mineral compositions and textures suggest sample is an equilibrated basaltic eucrite breccia (M-S3, low weathering).

Specimens: John Higgins holds the main masses. 7 slices, endpieces and fragments weighing 27.98 g, a polished mount and thin section are on deposit at App.

Data from:
  MB110
  Table 0
  Line 0:
Date:P 2020
Mass (g):271.6
Pieces:34
Class:eucrite
Shock stage:M-S3
Weathering grade:low
Ferrosilite (mol%):64.1±1.0; 29.1±1.7
Wollastonite (mol%):2.6±0.7; 42.6±2.0
Magnetic suscept.:2.92
Classifier:A. Love, App
Type spec mass (g):27.98
Type spec location:App
Main mass:John Higgins
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 Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Geography:

Mauritania
Coordinates:Unknown.

Statistics:
     This is 1 of 187 approved meteorites from Mauritania (plus 2 unapproved names) (plus 2 impact craters)

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