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Northwest Africa 13856
Basic information Name: Northwest Africa 13856
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13856
Observed fall: No
Year found: 2020
Country: Algeria
Mass:help 374 g
Classification
  history:
Recommended:  Achondrite-ung    [explanation]

This is 1 of 121 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 6 May 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13856 (NWA 13856)

Algeria

Purchased: 2020

Classification: Achondrite (ungrouped)

History: Fabien Kuntz purchased the 374.3 g sample from a meteorite prospector in Tindouf, Algeria, in 2020.

Physical characteristics: Sample has an irregular shape and a dark-brown exterior. The cut face shows a crystalline interior crosscut by black veins.

Petrography: Description and classification (A. Love, App) Sample shows poikilitic texture composed of (vol%): 1.5mm (n=12) orthorhombic pyroxene oikocrysts (30), anhedral-subhedral olivine (49) occurring as 76 µm (n=11) chadacrysts and 230 µm (n=23) phenocrysts and interstitial plagioclase (13). Lath-shaped pyroxenes share a preferred orientation and some are mantled with Ca-rich pyroxene. Vugs and vesicles occur within plagioclase. Chondrules are absent. Additional minerals are: albitic plagioclase with acicular inclusions of pyroxene, rare troilite, Ti-chromite, apatite, FeOH. Sample vestiges or relict chondritic-textured lithologies; evidence of rapid growth textures (cellular metal-sulfide mixtures, or spherical metal droplets).

Geochemistry: Olivine (Fa23.9±0.3, Fe/Mn=45.6±0.7, n=10); low-Ca Pyroxene (Fs20.0±0.8Wo3.9±1.5, Fe/Mn=28.2±0.7, n=12); high-Ca pyroxene (Fs13.1±0.7Wo33.5±2.2, Fe/Mn=22.1±0.6, n=5); plagioclase (Ab85.9±2.2Or3.5±0.6, n=6). Oxygen Isotopes: (Karen Ziegler, UNM) analyses of acid-washed subsamples by laser fluorination gave (all per mill): δ17O=3.536, 3.786, 3.682; δ18O=4.647, 5.172, 4.947; Δ17O=1.082, 1.055, 1.070.

Classification: Achondrite (ungrouped) strong shock, moderate weathering. Sample shows cumulate igneous texture, pyroxenes with compositional zoning and has mineralogic and isotopic similarities to L ordinary chondrites.

Specimens: Fabien Kuntz holds the main mass. An endcut weighing 32.12g and a polished thin section are on deposit at App.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Tindouf
Date:P 2020
Mass (g):374
Pieces:1
Class:Achondrite (ungrouped)
Shock stage:strong
Weathering grade:moderate
Fayalite (mol%):23.9±0.3
Ferrosilite (mol%):20.0±0.8; 13.1±0.7
Wollastonite (mol%):3.9±1.5; 33.5±2.2
Magnetic suscept.:4.01
Classifier:A. Love, App
Type spec mass (g):32.12
Type spec location:App
Main mass:Fabien Kuntz
Comments:Submitted by Anthony Love
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)
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
Kuntz: Fabien Kuntz, France; Website (private address)
Catalogs:
References: Published in Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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Photos:
CreditPhotos
Public domain photographs:
Anthony Love      
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 1232 approved meteorites from Algeria (plus 29 unapproved names) (plus 4 impact craters)

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