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Northwest Africa 14600
Basic information Name: Northwest Africa 14600
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14600
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 337 g
Classification
  history:
Recommended:  C3.00-ung    [explanation]

This is 1 of 5 approved meteorites classified as C3.00-ung.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), and Ungrouped chondrites
Comments: Approved 29 Jan 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14600 (NWA 14600)

(Northwest Africa)

Purchased: 2021

Classification: Carbonaceous chondrite (C3.00, ungrouped)

Physical characteristics: Individual meteorites with well-preserved fusion crust, showing a network of contraction cracks.

Petrography (K. Metzler, IfP): Carbonaceous chondrite, consisting of small chondrules, chondrule fragments, AOAs, and some CAIs, embedded in a black, fine-grained matrix. The mean apparent chondrule size is 133±145 µm (35-1196 µm; n=124). Mostly type I chondrules, but some type II chondrules and chondrule fragments occur. Several chondrules are rimmed by dust mantles. Point counting (n = 400) on BSE images revealed ~29 area% (vol%) fine-grained matrix, including dust mantles. Nearly all preexisting metal and sulfide appears to be replaced by pure magnetite. Point counting (n = 400) on BSE images revealed ~9 area% (vol%) magnetite, which roughly corresponds to ~15 wt% magnetite. Some tiny relicts of very Ni-rich metal (65 at% Ni) and sulfides (troilite and pentlandite) are present in the centers of magnetite grains. Some dust mantles are crosscut by magnetite veins.

Geochemistry: Mineral compositions and geochemistry: Mean value of randomly chosen olivine grains: Fa6.1±11.8 (Fa0.2-45.1; n=25). Mean value of randomly chosen low-Ca pyroxene grains: Fs2.4±1.9Wo1.2±0.8 (Fs0.8-9.0Wo0.2-3.5; n=27).

Classification: Carbonaceous chondrite based on the predominance of type I chondrules and CAI occurrence. Petrologic type 3 based on the strong chemical variation of olivine and pyroxene. This meteorite has textural and microchemical characteristics nearly identical to that of NWA 13689 (C3.00-ung). NWA 13689 and NWA 14600 were bought in Nouakchott within a year. They show very similar mean apparent chondrule sizes and matrix fractions and contain uniquely high amounts of magnetite (~15-18 wt%). Furthermore, based on the very characteristic fusion crust with contraction cracks, the individual stones of both meteorites are indistinguishable from each other. From this it can be proposed that NWA 13689 and NWA 14600 meteorites are likely paired.

Specimens: Largest individual: 121.0 g.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Nouakchott, Mauritania
Date:P 2021
Mass (g):337
Pieces:10
Class:C3.00-ung
Shock stage:C-S1
Weathering grade:low
Fayalite (mol%):6.1±11.8
Ferrosilite (mol%):2.4±1.9
Wollastonite (mol%):1.2±0.8
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:Ben Hoefnagels, Netherlands
Comments:Submitted by K. Metzler, IfP
Institutions
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Knut Metzler         
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8559 approved meteorites from (Northwest Africa) (plus 1896 unapproved names)

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