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Northwest Africa 15682
Basic information Name: Northwest Africa 15682
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15682
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 984 g
Recommended:  Howardite    [explanation]

This is 1 of 437 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Comments: Approved 4 Mar 2023
Writeup from MB 112:

Northwest Africa 15682 (NWA 15682)

(Northwest Africa)

Purchased: 2022

Classification: HED achondrite (Howardite)

History: Eleven samples of varying sizes (main masses: 116, 131, 147, 204 g) were found in Northwest Africa. Adrián Contreras Gómez-(CRATER meteorites) purchased the meteorites from Hmad Ait Hssain, in Errachidia, Morocco on July 29, 2022.

Physical characteristics: Sample is a rounded stone completely coated with a glossy black fusion crust. Clasts are visible through the crust. The cut face shows the sample has a brecciated interior composed of white, gray and dark-colored clasts in a light-gray host.

Petrography: Description and classification (A. Love, App) Sample is a breccia composed of mineral grains and lithic clasts that share a weak orientation. Mineral fragments are: low and high Ca pyroxenes (some are exsolved), rare olivine and plagioclase. Lithic fragments are: rare porphyritic and cumulate clasts, equilibrated clasts, shock melted-breccias, glassy fragments and ~8 vol% carbonaceous chondrite clasts (showing CAI’s and chondrules). Additional minerals are: FeNi grains, troilite, merrillite, ilmenite, chromite and secondary calcite.

Geochemistry: (A. Love, App) Olivine (Fa19.7±10.1, Fe/Mn=40.8±3.8, n=3); low Ca-pyroxene (Fs29.5±14.2Wo2.1±1.0, Fe/Mn=28.3±1.9 n=21); pigeonite (Fs48.5±6.5Wo11.0±7.3, Fe/Mn=31.4±2.6, n=3); high Ca pyroxene (Fs34.5±4.6Wo33.7±7.1, Fe/Mn=31.3±2.2, n=3); plagioclase (An93.9±1.5Or0.1±0.2, n=6).

Classification: HED achondrite (howardite) Sample is composed of ~62 vol% diogenite and ~30 vol% eucrite. Textures and mineral compositions suggest the sample is a HED polymict breccia.

Specimens: Adrián Contreras Gómez (CRATER meteorites) holds the main mass. A polished thin section and an individual weighing 34.56 g are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Errachidia, Morocco
Date:P 2022
Mass (g):984
Shock stage:M-S4
Weathering grade:W1
Fayalite (mol%):19.7±10.1
Ferrosilite (mol%):29.5±14.2; 48.5±6.5; 34.5±4.6
Wollastonite (mol%):2.1±1.0; 11.0±7.3; 33.7±7.1
Magnetic suscept.:4.73
Classifier:A. Love, App
Type spec mass (g):34.56
Type spec location:App
Main mass:Adrian Contreras Gómez (CRATER meteorites)
Comments:Submitted by Anthony Love
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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     This is 1 of 9042 approved meteorites from (Northwest Africa) (plus 1870 unapproved names)

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