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Northwest Africa 14607
Basic information Name: Northwest Africa 14607
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14607
Observed fall: No
Year found: 2022
Country: Algeria
Mass:help 816 g
Classification
  history:
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 300 approved meteorites (plus 2 unapproved names) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 29 Jan 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14607 (NWA 14607)

Algeria

Find: 2021

Classification: Martian meteorite (Shergottite)

History: Purchased by Matthew Stream from Bashir Saleck in 2022. Two identically appearing stones (621.7 + 194.6 g) were found together near Adrar, Algeria, in January 2021.

Physical characteristics: Dark brown, sandblasted exterior with remnants of fusion crust. Fresh chipped surface reveals the presence of shiny macroscopic maskelynite.

Petrography: (A. Ross and C. Agee, UNM) The two major phases in this meteorite are clinopyroxene and maskelynite. Ubiquitous minor phases are merrillite, apatite, titanomagnetite, ilmenite and troilite. The clinopyroxene has a modal abundance of approximately 65%, with significant core to rim zoning indicating an igneous crystallization trend with compositional zoning trends with sub-calcic augite and ferro-pigeonite clusters, Mg-rich orthopyroxene and Mg-Rich pigeonite compositions are absent. Clinopyroxene average grain size is approximately 300-500 μm. Maskelynite has modal abundance of approximately 25%, most grains are thin and elongate with maximum length ~1 mm. Silica-rich melt inclusions observed in maskelynite. Trace fayalite was detected.

Geochemistry: (A. Ross and C. Agee, UNM) Clinopyroxene (all) Fs49.8±24.1Wo22.3±8.5. Fe/Mn=35±6, n=20; sub-calcic augite Fs25.9Wo32.3±2.3, Fe/Mn=30±3, n=7; ferro-pigeonite Fs74.9±4.3Wo15.2±2.4, Fe/Mn=41±2, n=9; maskelynite An48.4±4.7Ab47.8±3.7Or3.8±1.0, n=6; silica-rich inclusions SiO2=79.1±1.2, Al2O3=12.0±1.4, CaO=1.2±0.3, Na2O=3.6±0.4, K2O=1.9±0.6 (wt%), n=2; fayalite Fa94.2, Fe/Mn=61.

Classification: Evolved pyroxene-phyric shergottite basalt.

Specimens: 20 g plus a probe mount on deposit at UNM, Matthew Stream holds the main masses.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Northwest Africa
Date:2021
Mass (g):816.2
Pieces:2
Class:Martian (shergottite)
Shock stage:high
Weathering grade:moderate
Fayalite (mol%):94.2
Ferrosilite (mol%):49.8±24.1
Wollastonite (mol%):22.3±8.5
Classifier:C. Agee, UNM
Type spec mass (g):20
Type spec location:UNM
Main mass:Matthew Stream
Comments:Field name BAS-16; submitted by C. Agee
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. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1306 approved meteorites from Algeria (plus 30 unapproved names) (plus 4 impact craters)

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