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Northwest Africa 14179
Basic information Name: Northwest Africa 14179
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14179
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 265 g
Classification
  history:
Recommended:  C3-ung    [explanation]

This is 1 of 22 approved meteorites classified as C3-ung.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), and Ungrouped chondrites
Comments: Approved 6 Oct 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 14179 (NWA 14179)

(Northwest Africa)

Purchased: 2020 Dec

Classification: Carbonaceous chondrite (C3, ungrouped)

History: Purchased by Eric Twelker in December 2020 from a Moroccan dealer.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL; L. Garvie, ASU) Well-formed, relatively small chondrules (apparent diameter 230±130 µm, N = 20) are set in a very fine grained matrix (~50 vol. %, almost opaque in thin section). Accessory phases identified by electron microprobe analysis include Al-Ti-diopside, pentlandite, kamacite and minor pure Fe metal (associated with some forsterite in chondrules). Fe-rich material with low oxide sum ~91 wt.% present as rims on some chondrules appears to be a possible chlorite-like phase. The powder X-ray diffraction pattern shows sharp reflections from silicates (bimodal olivine dominated by low Fa and high Fa components, as well as clinopyroxene), pentlandite, pyrrhotite, magnetite and calcite, which sit on a broad scattering component centered around 2.7 Å, consistent with a high percentage of amorphous material. Discrete reflections for phyllosilicates are lacking, though a broad, low-intensity, low-angle scattering centered around 12Å, is consistent with a minor component possessing smectite-like layering.

Geochemistry: Olivine (Fa29.0±25.5, range Fa0.3-63.1, N = 6), low-Ca pyroxene (Fs15.2±22.1Wo1.1±0.1, range Fs1.1-40.7Wo1.1-1.2, N = 3), subcalcic augite (Fs2.0Wo29.8), Al-Ti-diopside (Fs1.1Wo44.8, Al2O3 13.2 wt.%, TiO2 0.9 wt.%). Oxygen isotopes (K. Ziegler, UNM): analysis of acid-washed subsamples by laser fluorination gave, respectively, δ17O -8.622, -12.071, -7.239; δ18O -4.730, -8.269, -2.618; Δ17O -6.125, -7.704, -5.857 per mil (all data linearized).

Classification: Carbonaceous chondrite (C3 ungrouped). This material is very similar to Telakoast 001 and NWA 14139 in many respects, including texture, mineralogy, mineral compositions, and oxygen isotopes (plotting in the same region below the CCAM trend).

Specimens: 20.8 g plus one polished thin section at UWB; remainder with Twelker.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020 Dec
Mass (g):265
Pieces:many
Class:C3-ung
Shock stage:S1
Weathering grade:low
Fayalite (mol%):29.0±25.5
Ferrosilite (mol%):15.2±22.1
Wollastonite (mol%):1.1±0.1
Classifier:A. Irving, UWS, and P. Carpenter, WUSL
Type spec mass (g):20.8
Type spec location:UWB
Main mass:Twelker
Comments:Work name ET21-1; 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)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
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)
Twelker: Eric Twelker, P.O. Box 844, Port Townsend, WA 98368, United States; Website (private address; updated 1 Dec 2014)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8025 approved meteorites from (Northwest Africa) (plus 1951 unapproved names)

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