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Northwest Africa 14853
Basic information Name: Northwest Africa 14853
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14853
Observed fall: No
Year found: 2021
Country: Western Sahara
Mass:help 460 g
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 660 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 11 Dec 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14853 (NWA 14853)

Western Sahara

Purchased: 2021

Classification: Ureilite

History: Adrián Contreras Gómez (CRATER Meteorites) A single sample was found by a nomad. This meteorite was purchased by Adrián Contreras Gómez in El Aaiún, Western Sahara, in 2021.

Physical characteristics: The sample has an ovoid shape and has a dark-brown exterior showing small, green, translucent in some regions. The cut face shows the is crystalline.

Petrography: (A. Love, App) Sample shows a protogranular texture dominated by weakly-aligned, 1080 μm (avg. grain size, n=32) olivine with 4447 μm (avg. grainsize, n=2) poikilitic pigeonite oikocrysts. Olivine shows reduced grain boundaries and interstitial areas show rare unaltered blebs of Fe metal, Na-Al glass and high Ca-pyroxene (Fs3Wo9). Additional minerals are: graphite, chromite and rare sulfides and altered Fe metal.

Geochemistry: Olivine cores Fa20.8±0.4, Fe/Mn (molar)=44.5±1.6, Cr2O3 (wt%) =0.7±0.0, n=17; Olivine reduced rims Fa17.2±3.6, Fe/Mn=34.8±0.1, Cr2O3=0.7±0.1 n=8. Olivine CaO=0.27±0.02 wt% (n=25); pigeonite (Fs18.5±0.1Wo6.2±0.1, Fe/Mn=27.0±1.4, n=9); high Ca pyroxene (Fs3.8±1.3Wo39.2±1.0, Fe/Mn=27.0±1.4, n=3).

Classification: Achondrite (Ureilite) Mineral compositions and textures suggest sample is a ureilite.

Specimens: Adrian Contreras Gomez (CRATER meteorites) holds the main mass. A polished thin section, an end cut weighing 22.78 g are on deposit at App.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:El Aaiùn
Date:P 2021
Mass (g):460
Pieces:1
Class:Ureilite
Shock stage:U-S2
Weathering grade:low
Fayalite (mol%):19.6±2.6
Ferrosilite (mol%):18.5±0.1; 3.8±1.3
Wollastonite (mol%):6.2±0.1; 39.2±1.0
Classifier:A. Love, App
Type spec mass (g):22.78
Type spec location:App
Main mass:Adrián Contreras Góme (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 Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Photos:
CreditPhotos
Public domain photographs:
Anthony Love      
Geography:

Western Sahara
Coordinates:Unknown.

Statistics:
     This is 1 of 280 approved meteorites from Western Sahara (plus 20 unapproved names)
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Revision
  history:
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