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Northwest Africa 14500
Basic information Name: Northwest Africa 14500
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14500
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 28.2 g
Classification
  history:
Recommended:  Achondrite-ung    [explanation]

This is 1 of 140 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 19 Feb 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14500 (NWA 14500)

(Northwest Africa)

Purchased: March 2021

Classification: Ungrouped achondrite

Petrography: (J. Gattacceca, CEREGE) Metamorphic rock with granoblastic texture. Mineralogy: orthopyroxene and olivine grains with typical size 1.2 mm (63 vol%), plagioclase with grain size 400 µm (15 vol%), contorted metal grains to several mm (20 vol%), and troilite (3.5 vol%). Modal abundances are by point counting (n=256). Some olivine and pyroxene grains are poikilitically enclosed in plagioclase. Accessory chromite. No relict chondrules have been observed.

Geochemistry: Olivine Fa23.7±0.8, FeO/MnO 50.6 (n=4). Orthopyroxene Fs20.4±0.4Wo3.5±0.4, FeO/MnO = 33.3±4.1 (n=6). Plagioclase An0.0±0.0Ab95.0±0.2Or5.0±0.2 (n=4). Oxygen isotopic composition (J, Gattacceca, C, Sonzogni, CEREGE) from analysis of one 1.5 mg aliquot of a powdered 266 mg bulk sample treated using ethanolamine-thioglycollate (EATG) and magnetic extraction of metal is δ17O=1.22‰, δ18O=4.63‰ , Δ17O=-1.19‰ (slope 0.52, analytical uncertainties 0.08‰, 0.12‰, 0.03‰ respectively).

Classification: Achondrite, ungrouped. While the mineralogy and mineral chemistry are similar to that of L chondrites, the O-isotope compositions and the metal content (20 vol%) rule out a relationship with the L chondrites.

Specimens: Type specimen at CEREGE. Main mass with Kuntz.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Tindouf, Algeria
Date:P March 2021
Mass (g):28.2
Pieces:1
Class:Achondrite-ung
Weathering grade:moderate
Fayalite (mol%):23.7±0.8
Ferrosilite (mol%):20.4±0.4
Wollastonite (mol%):3.5±0.4
Magnetic suscept.:5.60
Classifier:J. Gattacceca, CEREGE
Type spec mass (g):5.94
Type spec location:CEREGE
Main mass:Kuntz
Finder:anonymous
Comments:work name K545; submitted by Jérôme Gattacceca
Plots: O isotopes:  
Institutions
   and collections		 CEREGE: CEREGE BP 80 Avenue Philibert, Technopole de l'Arbois 13545 Aix-en-Provence Cedex 4 France, France (institutional address; updated 10 Jun 2023)
Kuntz: Fabien Kuntz, France; Website (private address)
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:
Jerome Gattacceca   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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