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Northwest Africa 15421
Basic information Name: Northwest Africa 15421
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15421
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 613 g
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  Iron, IVA
Recommended:  Iron, IVA    [explanation]

This is 1 of 84 approved meteorites (plus 1 unapproved name) classified as Iron, IVA.   [show all]
Search for other: Iron meteorites, IVA irons, and Metal-rich meteorites
Comments: Approved 4 Dec 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 15421 (NWA 15421)

(Northwest Africa)

Purchased: 2021

Classification: Iron meteorite (IVA)

History: Bought from a Moroccan meteorite dealer in 2021. Reportedly found in Algeria.

Petrography: (K. Metzler, IfP) Iron meteorite with striking recrystallization texture. Relictic octahedrite structure is visible with thin kamacite and taenite lamellae. Apparent band width (µm) of kamacite is 141±88 (48-370; n=40). The sizes of secondary grains are on the order of the kamacite band widths.

Geochemistry: Mineral compositions and geochemistry: The bulk Ni content, determined by SEM-EDX, is 8.5 wt%. Furthermore, the concentrations of Ni, Co and trace elements in this sample (and in Cape York and Muonionalusta as reference materials) were determined by dissolution ICP-MS (F. Spitzer, IfP): Ni 8.2 wt%; Co 0.39 wt%; Ga 2.2 µg/g; Rh 0.8 µg/g; Mo 5.8 µg/g.

Classification: Bulk chemical data (Ni, Ga) and original structure are consistent with a IVA iron meteorite (finest octahedrite). Original texture modified by extensive recrystallization.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2021
Mass (g):613
Pieces:2
Class:Iron, IVA
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:Anonymous
Comments:Submitted by K. Metzler, IfP
Institutions
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
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:
Knut Metzler      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9729 approved meteorites from (Northwest Africa) (plus 1859 unapproved names)

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