header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 1 Apr 2023
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
Northwest Africa 15027
Basic information Name: Northwest Africa 15027
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15027
Observed fall: No
Year found: 2022
Country: Niger
Mass:help 985 g
Classification
  history:
Recommended:  Mesosiderite    [explanation]

This is 1 of 241 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 4 Mar 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15027 (NWA 15027)

Niger

Purchased: 2022 Jan

Classification: Mesosiderite

History: Found in Niger and purchased by Mbark Arjdal in January 2022 from a dealer in Niger.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) This specimen is a heterogeneous breccia containing sporadic larger, polygranular aggregates of olivine (up to 7 by 8 mm in size) and smaller clasts of anorthite in a matrix composed in some places of intergrown orthopyroxene and anorthite with minor silica polymorph and in other places composed of intergrown metal and orthopyroxene. Kamacite (typically altered to Fe oxides) is distributed irregularly. The original metal content is estimated to ~40 vol%. Accessory phases include troilite, Al-Mg-rich chromite and merrillite. Cross-cutting veinlets of secondary Fe hydroxides are present.

Geochemistry: Orthopyroxene (Fs28.0-28.8Wo1.5-2.1; Fs35.4-36.1Wo3.2-3.5; FeO/MnO = 26-29; N = 4), olivine (Fa27.2-30.1, FeO/MnO = 41-43, N = 6), anorthite (An90.2-93.6Or0.2, N = 3).

Classification: Mesosiderite (breccia).

Specimens: 23.0 g including a polished mount at UWB; remainder with Mr. M. Arjdal.

Data from:
  MB112
  Table 0
  Line 0:
Place of purchase:Niger
Date:P 2022 Jan
Mass (g):985
Pieces:many
Class:Mesosiderite
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):27.2-30.1
Ferrosilite (mol%):28.0-36.1
Wollastonite (mol%):1.5-3.4
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):23.0
Type spec location:UWB
Main mass:M. Arjdal
Comments:Work name Arj ZM 811; submitted by A. Irving
Institutions
   and collections		 UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
A. Irving   
Geography:

Niger
Coordinates:Unknown.

Statistics:
     This is 1 of 106 approved meteorites from Niger (plus 4 unapproved names)

Direct link to this page