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Northwest Africa 12748
Basic information Name: Northwest Africa 12748
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12748
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 36 g
Classification
  history:
Recommended:  CM2    [explanation]

This is 1 of 529 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Approved 3 Aug 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12748 (NWA 12748)

(Northwest Africa)

Purchased: 2019

Classification: Carbonaceous chondrite (CM2)

History: Two stones weighing 36 g were found in Morocco prior to 2019 and were purchased by John Sinclair and J. Donald Cline at the 2019 Tucson Gem and Mineral Show.

Physical characteristics: Sample is dark black in color, irregularly shaped, and has ~25% crust coating one side. Cut face of the sample shows small chondrules and CAIs set within a dark-colored matrix.

Petrography: Description and classification (A. Love, App): Sample is shows chondritic texture composed of chondrules, fragments, and CAIs (~42 vol %) distributed throughout a black fine-grained matrix (~58 vol%). Porphyritic chondrules have an average diameter of 330 µm with chemical zonation. Additional minerals are: pentlandite, calcite, tochilinite, pyrrhotite, kamacite.

Geochemistry: (A. Love, App) Olivine: Type I chondrules Fa0.9±0.7 (Fa0.3-2.2), N=6; Type II chondrules Fa39.9±15.2 (Fa16.7-63.4), N=14 Low Ca-pyroxene: Fs2.3±1.7Wo1.4±1.1(Fs1.1-5.4Wo0.2-3.5, N=10).

Classification: Carbonaceous chondrite (CM2)/ Based on matrix abundance, chondrule size and mineralogy this is a CM2.

Specimens: PARI holds the main mass. One endcut weighing 9.3 g and a polished thin section are on deposit at App.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Tucson Gem and Mineral Show
Date:P 2019
Mass (g):36
Pieces:2
Class:CM2
Shock stage:low
Weathering grade:low
Fayalite (mol%):0.9±0.7; 39.9±15.2
Ferrosilite (mol%):2.3±1.7
Wollastonite (mol%):1.4±1.1
Magnetic suscept.:4.36
Classifier:A. Love, App
Type spec mass (g):9.3
Type spec location:App
Main mass:PARI
Finder:Unknown
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)
PARI: Pisgah Astronomical Research Institute 1 Pari Dr Rosman, NC 28772, United States (institutional address; updated 13 Sep 2016)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6877 approved meteorites from (Northwest Africa) (plus 2037 unapproved names)

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