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Northwest Africa 13302
Basic information Name: Northwest Africa 13302
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13302
Observed fall: No
Year found: 2020
Country: Morocco
Mass:help 403 g
Classification
  history:
Recommended:  Mesosiderite-A3    [explanation]

This is 1 of 5 approved meteorites classified as Mesosiderite-A3.   [show all]
Search for other: Class A mesosiderites, Mesosiderites, and Metal-rich meteorites
Comments: Approved 31 May 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13302 (NWA 13302)

Morocco

Purchased: 2020

Classification: Mesosiderite- A3

History: The 402.8 g sample was found in Morocco. Fabien Kuntz purchased the sample in Zagora, Morocco, in February 2020.

Physical characteristics: Sample is irregular in shape and has a reddish-brown exterior with visible flakes of metal protruding through the surface. The cut face shows a metal-rich interior with angular clasts of pyroxene.

Petrography: Sample is a breccia composed of: 0.5-10 mm clasts of normally zoned, anhedral orthopyroxene (Fs18-32Wo0.9-2.4) and 8 vol% unzoned, anhedral olivine (Fa34.72-37.49) set within a matrix of: 523 μm (avg. grain size) poikiloblastic, exsolved Opx (Fs34.5±1.4Wo2.4±0.23) (all pyx 47 vol%); 257 μm anhedral plagioclase (22 vol%), and 18 vol% cm-sized rounded nuggets and irregularly shaped intergrowths of FeNi metal. Matrix pyroxenes show lamellar to blebby exsolution. Olivine shows reaction coronas. Orthopyroxene makes up 63% of silicates and plagioclase makes up 31% of silicates. Additional minerals are: kamacite, taenite, lath-shaped Si polymorph (5 vol%), apatite, troilite, FeNi metal, chromite, trace ilmenite.

Geochemistry: (A. Love, App) Olivine, Fa36.1±1.4 (Fa34.7-37.5), Fe/Mn=36.8-36.8, n=2); low-Ca pyroxene, Fs30.6±4.5Wo2.0±0.5 (Fs23.0-35.6Wo1.4-2.7,Fe/Mn=25.3±2.6, n=8); high-Ca pyroxene (Fs17.2Wo38.8, n=1); plagioclase (An93.0±1.0Or0.1±0.0, n=8).

Classification: Mesosiderite (class A3) Sample is type A based on modal abundance of plagioclase and orthopyroxene. Sample is type 3 based on poikioblastic texture with interlocking grain boundaries and inverted, exsolved pyroxenes.

Specimens: Fabien Kuntz holds the main mass. An endcut and part slice weighing 33.9 0g and a polished mount are on deposit at App.

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Zagora, Morocco
Date:P 2020
Mass (g):402.8
Pieces:1
Class:Mesosiderite-A3
Shock stage:low
Weathering grade:low
Fayalite (mol%):36.1±1.4
Ferrosilite (mol%):30.6±4.5; 17.2
Wollastonite (mol%):2.0±0.5; 38.8
Magnetic suscept.:5.72
Classifier:A. Love, App
Type spec mass (g):33.9
Type spec location:App
Main mass:Fabien Kuntz
Comments:Submitted by Anthony Love
Institutions
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
Kuntz: Fabien Kuntz, France; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1503 approved meteorites from Morocco (plus 22 unapproved names) (plus 1 impact crater)

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