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Northwest Africa 12750
Basic information Name: Northwest Africa 12750
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12750
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 46 g
Meteoritical Bulletin:  MB 108  (2020)  CO3
Recommended:  CO3    [explanation]

This is 1 of 616 approved meteorites (plus 1 unapproved name) classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 6 Oct 2019
Writeup from MB 108:

Northwest Africa 12750 (NWA 12750)

(Northwest Africa)

Purchased: 2019

Classification: Carbonaceous chondrite (CO3)

History: A 46 g stone, comprising 3 pieces that fit together, was found in the Western Sahara prior to 2018. The sample was sold to a meteorite dealer and subsequently purchased during the 2019 Tucson Gem and Mineral Show.

Physical characteristics: The sample lacks fusion crust, is dark brown in color and irregularly shaped. Small chondrules are visible on the surface. Small chondrules and CAIs are visible on the cut face.

Petrography: (A. Love, App): Sample has a chondritic texture composed of chondrules with an average diameter of 150 μm (N=57), abundant amoeboid olivine aggregates and CAIs set within a fine-grained opaque matrix (~36 vol%).

Geochemistry: (A. Love, App) Olivine: Fa19.4±20.4(Fa0.4-64.4), Fe/Mn=60.1±43.3), N=32 chondrules (14 Type I chondrules with Fa0.92±0.40, and 18 Type II chondrules with Fa33.8±16.0). Cr2O3 in ferroan olivine = 0.3±0.1, N=18. Low Ca pyroxene: Fs4.1±3.3Wo1.0±0.7 (Fs1.3-12.5Wo0.3-2.8), N=15.

Classification: Carbonaceous Chondrite (CO3). Based on chondrule size and unequilibrated compositions of olivine and pyroxene, sample is a type 3 CO chondrite. Mean and standard deviation of Cr2O3 in ferroan olivine plots next to Acfer 094 designated by Grossman and Brearley (2005) as CO3.0

Specimens: The main mass is held at PARI. An 9.3 g fragment and a polished thin section are on deposit at App.

  • Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)
Data from:
  Table 0
  Line 0:
Place of purchase:Tucson Gem and Mineral Show
Date:P 2019
Mass (g):46
Shock stage:C-S1
Weathering grade:low
Fayalite (mol%):25.7±20
Ferrosilite (mol%):4.1±3.3
Wollastonite (mol%):1.0±0.7
Magnetic suscept.:4.59
Classifier:A. Love, App
Type spec mass (g):9.3
Type spec location:App
Main mass:PARI
Comments:Submitted by Anthony Love
   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)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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     This is 1 of 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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