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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:
Meteoritical Bulletin:  MB 111  (2023)  Achondrite-ung
Recommended:  Achondrite-ung    [explanation]

This is 1 of 160 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 Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Photos:
CreditPhotos
Public domain photographs:
Jerome Gattacceca   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9914 approved meteorites from (Northwest Africa) (plus 1841 unapproved names)

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