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Northwest Africa 8561
Basic information Name: Northwest Africa 8561
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8561
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 404 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Mesosiderite-A1
Recommended:  Mesosiderite-A1    [explanation]

This is 1 of 7 approved meteorites classified as Mesosiderite-A1.   [show all]
Search for other: Class A mesosiderites, Mesosiderites, and Metal-rich meteorites
Comments: Approved 18 Oct 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8561 (NWA 8561)

(Northwest Africa)

Purchased: 2013

Classification: Mesosiderite (group A1)

History: Purchased by Brahim Tahiri from a Moroccan hunter and sent to his partner Sean Tutorow for classification, April, 2013.

Physical characteristics: Single stone, weathered irregular exterior. Saw cut reveals a brown-colored, fine-grained breccia, oxidation present.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows approximately 50% oxidized iron, with some remnant metal (kamacite and taenite); zoned orthopyroxene makes up approximately 70% of the silicate portion, with plagioclase at ~25%, grain size up to 300 μm. Apatite, chromite, and silica present.

Geochemistry: (C. Agee and N. Muttik, UNM) Olivine Fa57.4±4.5, Fe/Mn=46±1, n=2; low-Ca pyroxene Fs40±1.0Wo4.7±3.4, Fe/Mn=30±3, n=15; plagioclase An87.7±2.7, n=6.

Classification: Mesosiderite A1, high weathering grade.

Specimens: 21.8 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass.

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2013
Mass (g):403.74
Pieces:1
Class:Mesosiderite-A1
Weathering grade:high
Classifier:C. Agee, UNM
Type spec mass (g):21.8
Type spec location:UNM
Main mass:Sean Tutorow
Comments:Field name G588; 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. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6781 approved meteorites from (Northwest Africa) (plus 2047 unapproved names)

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