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Northwest Africa 14286
Basic information Name: Northwest Africa 14286
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14286
Observed fall: No
Year found: 2021
Country: Algeria
Mass:help 750 g
Classification
  history:
Recommended:  CO3    [explanation]

This is 1 of 616 approved meteorites (plus 1 unapproved name) classified as CO3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 31 Oct 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 14286 (NWA 14286)

Algeria

Purchased: 2021

Classification: Carbonaceous chondrite (CO3)

History: Purchased in 2021, reportedly found in Algeria.

Physical characteristics: Four identically appearing stones found together. Exterior covered in dark colored fusion crust. Broken surface reveals many small dark brown chondrules set in a light brown groundmass.

Petrography: (C. Agee, UNM) Reflected light microscopy shows numerous small chondrules, most in the 50-300 micron apparent diameter range, many of which are porphyritic. All observed chondrules were less than 500 microns in diameter. Opaques minerals are metal and troilite. Sparse fine-grained CAIs are present.

Geochemistry: (C. Agee, UNM) Olivine Fa27.6±12.3, Fe/Mn=118±37, Cr2O3=0.09±0.09 wt%, n=32; low-Ca pyroxene Fs2.7±1.1Wo0.9±0.2, n =7; diopside Fs2.1±1.2Wo39.9±1.6, n=3. Oxygen isotopes (K. Ziegler, UNM): 2 acid-washed fragments analyzed by laser fluorination gave δ18O= -1.851, -2.602; δ17O= -5.781, -6.48; Δ17O= -4.804, -5.106 (linearized, all per mil, TFL slope=0.528).

Classification: Carbonaceous chondrite CO3 based on oxygen isotopes and chondrule size.

Specimens: 22.75 g on deposit at UNM, Simon de Boer holds the main mass.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:(Northwest Africa)
Date:P 2021
Mass (g):750
Pieces:4
Class:CO3
Shock stage:low
Weathering grade:low
Fayalite (mol%):27.6±12.3
Ferrosilite (mol%):2.7±1.1; 2.1±1.2
Wollastonite (mol%):0.9±0.2; 39.9±1.6
Classifier:C. Agee, UNM
Type spec mass (g):22.75
Type spec location:UNM
Main mass:Simon de Boer
Comments:Fieldname SB3; submitted by C. Agee
Plots: O isotopes:  
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Ryan Upchurch   
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1223 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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