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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 176 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 Meteoritical Bulletin, no. 110, in preparation (2021)
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Photos:
CreditPhotos
Public domain photographs:
Ansgar Greshake            
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7937 approved meteorites from (Northwest Africa) (plus 1960 unapproved names)

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