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Northwest Africa 12229
Basic information Name: Northwest Africa 12229
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12229
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass:help 675 g
Meteoritical Bulletin:  MB 107  (2018)  CV3
Recommended:  CV3    [explanation]

This is 1 of 602 approved meteorites (plus 1 unapproved name) classified as CV3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites
Comments: Approved 13 Nov 2018
Writeup from MB 107:

Northwest Africa 12229 (NWA 12229)

(Northwest Africa)

Purchased: 2017

Classification: Carbonaceous chondrite (CV3)

History: A single stone weighing 675 g was found in Morocco prior to 2016. J. Donald Cline and John Sinclair acquired the sample from a meteorite dealer at the Tucson Gem and Mineral Show in February 2017.

Physical characteristics: Sample is dark brown in color, rounded to irregular in shape and lacks fusion crust. Sample is coated on the bottom and sides with caliche, some of which contains rounded sand grains. Chondrules and CAIs are visible through the patina. The cut face shows abundant chondrules, CAIs and AOAs.

Petrography: Description and classification (A. Love, App): Sample contains distinct chondrules (average diameter of 743 µm (N=29), fragments and refractory inclusions (CAIs up to 1 mm) all set within an opaque dark brown matrix. Matrix contains FeO-rich olivine and has a weak fabric defined by slightly elongated chondrules and oriented amoeboid olivine aggregates. Type I olivine chondrules are dominant. Sample has 40% matrix.

Geochemistry: (A. Love, App) Olivine Fa 11.3±15.6 (0.6-49.7), N=16; low Ca pyroxene Fs1.4±0.4Wo1.1±0.8 (Fs0.8-2.2Wo0.5-3.6), N=11.

Classification: CV3. CV based on diameter of chondrules, matrix abundance and ubiquitous CAIs. CV subgroup based on magnetic susceptibility. Type 3 based upon unequilibrated compositions of chondrules.

Specimens: PARI holds the main mass. One endcut weighing 28 g and a polished thin section are on deposit at App.

Data from:
  Table 0
  Line 0:
Place of purchase:Tucson Gem and Mineral Show
Date:P 2017
Mass (g):675
Shock stage:low
Weathering grade:moderate
Fayalite (mol%):11.3±15.6
Ferrosilite (mol%):1.4±0.4
Wollastonite (mol%):1.1±0.8
Magnetic suscept.:3.91
Classifier:A. Love, App
Type spec mass (g):28
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. 107, MAPS 55, 460-462
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     This is 1 of 8904 approved meteorites from (Northwest Africa) (plus 1871 unapproved names)

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