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Northwest Africa 13950
Basic information Name: Northwest Africa 13950
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13950
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 200 g
Classification
  history:
Recommended:  CR2    [explanation]

This is 1 of 184 approved meteorites classified as CR2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites
Comments: Approved 18 Sep 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13950 (NWA 13950)

(Northwest Africa)

Purchased: 2021 Jan

Classification: Carbonaceous chondrite (CR2)

History: The meteorite was purchased from a meteorite dealer in Nouadhibou, Mauritania, in late January, 2021.

Physical characteristics: Seventeen brownish fragments without fusion crust.

Petrography: The meteorite is composed of abundant large and mostly porphyritic type I chondrules (apparent mean diameter about 700 μm) set into a fine-grained iron-rich matrix. Few type II chondrules but no CAIs have been found in the two sections studied. Type I chondrules are often metal-decorated and contain abundant metal blebs. Type II chondrules contain sulfides and very rare metal. The matrix contains framboids of ~1 μm-sized round to euhedral magnetite grains and low analytical totals suggest presence of hydrous mineral phases.

Geochemistry: olivine in type I chondrules: Fa2.5±1.4 (Fa1.1-5.4, Cr2O3: 0.65±0.08 wt%, n=20; low-Ca pyroxene: Fs2.3±1.3Wo1.3±0.7 (Fs1.2-4.9Wo0.8-3.2, n=13); Fe-rich olivine grains: Fa37.8±6.1 (Fa32.0-49.9, n=6). Matrix analyses yield an average total of 87.8±0.7 wt% (5 μm defocused beam, n=5) suggesting the presence of hydrous minerals.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Nouadhibou, Mauritania
Date:P 2021 Jan
Mass (g):200
Pieces:17
Class:CR2
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):2.5; 37.8
Ferrosilite (mol%):2.3
Wollastonite (mol%):1.3
Classifier:A. Greshake, MNB
Type spec mass (g):25.8
Type spec location:MNB
Main mass:Salamu Ali
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum f├╝r Naturkunde, Invalidenstra├če 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Catalogs:
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Photos:
CreditPhotos
Public domain photographs:
Ansgar Greshake            
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8745 approved meteorites from (Northwest Africa) (plus 1880 unapproved names)

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