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Northwest Africa 14792
Basic information Name: Northwest Africa 14792
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14792
Observed fall: No
Year found: 2021
Country: Western Sahara
Mass:help 310 g
Classification
  history:
Recommended:  CR2    [explanation]

This is 1 of 184 approved meteorites classified as CR2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites
Comments: Approved 6 Aug 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14792 (NWA 14792)

Western Sahara

Purchased: 2021

Classification: Carbonaceous chondrite (CR2)

History: Samples were purchased by Adrián Contreras Gómez (CRATER meteorites) from Didi Baidari in October 2021 in Laayoune, Western Sahara.

Physical characteristics: The type specimen is composed of numerous dark colored, angular, cm-sized fragments. Cut face of samples shows chondritic texture with sparse rounded FeNi metal grains.

Petrography: Description and classification (A. Love, App) Sample shows a chondritic texture composed of distributed chondrules set within a dark-colored matrix (~50vol%) containing small FeS grains. FeNi droplets exist within chondrules and rarely as isolated grains within the matrix. Poikilitic pyroxene chondrules are dominant and have an average diameter of 814 μm, n=30. Many chondrules contain and are decorated with rims containing rounded oxidized grains (presumed to be former FeNi) and microchondrules. Additional minerals are: troilite, phosphates and chromite.

Geochemistry: (A. Love, App) Olivine (type I: Fa2.6±1.9, Fe/Mn=22.9±14.5, n=14; type II: Fa14.3±3.2, Fe/Mn=35.7±11.4, n=6); low Ca pyroxene (Fs4.8±3.9Wo1.0±1.0, Fe/Mn=24.2±11.1, n=10). Analytical totals from matrix: 89.4±5.5 wt% suggest hydrous components within matrix.

Classification: Carbonaceous chondrite (CR2, C-S3) Based on chondrule diameter, matrix abundance, presence of metals (implied from weathering products within and surrounding chondrules), lack of CAIs and presence of hydrated components within the matrix, this sample is a CR2.

Specimens: Adrián Contreras Gómez (CRATER Meteorites) holds the main mass. A polished thin section and many small fragments totaling the 20.30 g type specimen are on deposit at App.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Laayoune
Date:P 2021
Mass (g):310
Pieces:many
Class:CR2
Shock stage:C-S3
Weathering grade:moderate
Fayalite (mol%):6.1±6.0
Ferrosilite (mol%):4.8±3.9
Wollastonite (mol%):1.0±1.0
Classifier:A. Love, App
Type spec mass (g):20.3
Type spec location:App
Main mass:Adrián Contreras Gómez (CRATER Meteorites)
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 Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Western Sahara
Coordinates:Unknown.

Statistics:
     This is 1 of 261 approved meteorites from Western Sahara (plus 20 unapproved names)

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