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Northwest Africa 13903
Basic information Name: Northwest Africa 13903
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13903
Observed fall: No
Year found: 2021
Country: Algeria
Mass:help 1753 g
Classification
  history:
Meteoritical Bulletin:  MB 110  (2022)  Diogenite
Recommended:  Diogenite    [explanation]

This is 1 of 520 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 6 May 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13903 (NWA 13903)

Algeria

Purchased: 2021

Classification: HED achondrite (Diogenite)

History: Purchased from Mostafa Hnini and Ali Mftah both Mauritanian meteorite dealers. Reportedly found in the border region between Algeria and Mali close to Erg Chech in 2020.

Physical characteristics: Ten identically appearing stones found together. Partially fresh fusion crusted. Saw-cut surfaces reveal coarse dark gray-blue grains set in an orange-brown groundmass.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows fragmental breccia with ~90% orthopyroxene. Accessory phases are olivine, troilite, chromite, and iron metal. No plagioclase was detected.

Geochemistry: (C. Agee, UNM) Olivine Fa29.6±1.4, Fe/Mn=47±3, n=4; low-Ca pyroxene Fs24.6±2.0Wo1.4±0.1, Fe/Mn=26±1, n=8.

Classification: HED diogenite (olivine-bearing)

Specimens: 21 g on deposit at UNM, Matthew Stream holds the 1100 g, Ari Machiz holds 450 g.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2021
Mass (g):1753
Pieces:10
Class:Diogenite
Shock stage:high
Weathering grade:low
Fayalite (mol%):29.6±1.4
Ferrosilite (mol%):24.6±2.0
Wollastonite (mol%):1.4±0.1
Classifier:C. Agee, UNM
Type spec mass (g):21
Type spec location:UNM
Main mass:Matthew Stream
Comments:Field name MST-1; submitted by C. Agee, UNM
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
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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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Ryan Upchurch   
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1336 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters)
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Revision
  history:
  This lists important revisions made to data for this record.

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