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Northwest Africa 14740
Basic information Name: Northwest Africa 14740
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14740
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 421 g
Classification
  history:
Recommended:  C3-ung    [explanation]

This is 1 of 26 approved meteorites classified as C3-ung.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), and Ungrouped chondrites
Comments: Approved 20 Jun 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14740 (NWA 14740)

(Northwest Africa)

Purchased: 2021

Classification: Carbonaceous chondrite (C3, ungrouped)

History: Purchased jointly by Juan Poblador and Roger Jones in 2021 from an Algerian dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL; L. Garvie, ASU) Relatively small, well-formed chondrules (apparent diameter 310±280 µm, N = 26) accompanied by zoned mineral grains, AOA and rare very small, amoeboid, very fine grained CAI are set in a black ultra fine-grained matrix (~60 vol.%). Accessory phases detected by electron microprobe analysis include troilite, pentlandite, kamacite (as inclusions in chondrule olivine only) and calcite. No phyllosilicates were detected by powder X-ray diffraction analysis.

Geochemistry: Olivine (Fa23.1±23.8, range Fa0.9-58.1, N = 8), low-Ca pyroxene (Fs1.1±0.5Wo2.8±2.6, range Fs0.7-1.4Wo0.9-4.6, N = 2), subcalcic augite (Fs0.8Wo30.3). Oxygen isotopes (C. Sonzogni, J. Gattacceca, CEREGE): analysis of a 1.5 mm powdered sample by laser fluorination gave δ17O 1.41, δ18O 8.68, Δ17O -3.16 (for a TFL slope of 0.526), all per mil.

Classification: Carbonaceous chondrite (Type 3, ungrouped). Potentially paired with NWA 14139, NWA 14179 and other recently recovered ungrouped C3 chondrite specimens based on similarities in texture, mineralogy and especially oxygen isotopic composition.

Specimens: 22.0 g including one polished thin section at UWB; remainder equally with Mr. J. Poblador and Mr. R. Jones.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2021
Mass (g):421
Pieces:many
Class:C3-ung
Shock stage:S2
Weathering grade:low
Fayalite (mol%):23.1±23.8
Ferrosilite (mol%):1.1±0.5
Wollastonite (mol%):2.8±2.6
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):22.0
Type spec location:UWB
Main mass:J. Poblador and R. Jones
Comments:Work name JAP21-8; submitted by A. Irving
Plots: O isotopes:  
Institutions
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 29 Oct 2018)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
UWB: University of Washington, Box 353010 Seattle, WA 98195, United States (institutional address; updated 27 Jul 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8674 approved meteorites from (Northwest Africa) (plus 1882 unapproved names)

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