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Northwest Africa 14985
Basic information Name: Northwest Africa 14985
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14985
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 99 g
Classification
  history:
Recommended:  Diogenite-pm    [explanation]

This is 1 of 53 approved meteorites classified as Diogenite-pm.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 14 Sep 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14985 (NWA 14985)

(Northwest Africa)

Purchased: Sept 2021

Classification: HED achondrite (Diogenite, polymict)

History: Purchased by Ziyao Wang from a dealer in Algeria, Sept 2021

Petrography: The minerals in the meteorite include 100-500 ?m orthopyroxene (~80 vol.%), fine grained pigeonite (<10%) in the matrix, weakly zoned olivine (~5%), zoned magnesian olivine (~5%), and calcic plagioclase. Accessory minerals include augite, Ti-poor chromite, ilmenite, troilite, and kamacite. Most minerals display regular shape, but plagioclases and pyroxenes are irregular or barred in some clasts. There are ultrafine and irregular grains along the boundary of the clasts. Several orthopyroxenes are weakly zoned. There is exsolution augite lamellae in pigeonite. Some cracks are filled with barite, and some kamacite and troilite are oxidized, indicating that the meteorite is strongly weathered.

Geochemistry: Orthopyroxene: Fs26.8±8.3Wo2.8±1.1 (n=9), Fe/Mn: 31.1±4.2; pigeonite: Fs49.3±6.3Wo10.1±1.6 (n=8), Fe/Mn: 31.2±1.7; augite: Fs28.4±1.4Wo45.0±1.1 (n=2), Fe/Mn: 32.6±0.6; weakly zoned olivine: Fa33.3±4.7 (n=6), Fe/Mn: 50.5±2.7; zoned magnesian olivine: Fa16.3±1.6 (n=6), Fe/Mn: 41.9±2.7; calcic plagioclase: An94.0±2.2 (n=8).

Classification: Diogenite (polymict breccia). The classification is based on the Fe/Mn of pyroxenes, the abundance of olivine, the low TiO2 content in chromite, and the structure. Classification as a polymict type is based on the existence of pigeonite and augite (<10 vol.%).

Specimens: 19.8g and a polished thick sections at CUG; Ziyao Wang holds the main mass

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P Sept 2021
Mass (g):99
Pieces:1
Class:Diogenite-pm
Shock stage:high
Weathering grade:high
Fayalite (mol%):33.3; 16.3
Ferrosilite (mol%):26.8; 49.3; 28.4
Wollastonite (mol%):2.8; 10.1; 45.0
Classifier:Chen Wen, CUG
Type spec mass (g):19.8
Type spec location:CUG
Main mass:Ziyao Wang
Finder:anonymous
Comments:Submitted by Chen Wen, CUG
Institutions
   and collections
CUG: Planetary Science Institute, School of Earth Sciences China University of Geosciences (Wuhan) 388 Lumo Road, Wuhan, Hubei 430074, P. R. China, China (institutional address; updated 4 Feb 2019)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
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)
Ziyao Wang      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8636 approved meteorites from (Northwest Africa) (plus 1884 unapproved names)

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