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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:
Recommended:  Diogenite    [explanation]

This is 1 of 464 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 Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
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Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1118 approved meteorites from Algeria (plus 27 unapproved names) (plus 4 impact craters)

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