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Northwest Africa 16414
Basic information Name: Northwest Africa 16414
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16414
Observed fall: No
Year found: 2023
Country: (Northwest Africa)
Mass:help 218 g
Classification
  history:
Recommended:  Diogenite-pm    [explanation]

This is 1 of 63 approved meteorites classified as Diogenite-pm.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 25 Mar 2024
Writeuphelp
Writeup from MB 113:

Northwest Africa 16414 (NWA 16414)

(Northwest Africa)

Purchased: 2023

Classification: HED achondrite (Diogenite, polymict)

Petrography (K. Metzler, IfP): Fine-grained polymict achondritic breccia, consisting of mineral fragments and few lithic clasts, embedded in fine-grained related debris. Most fragments are diogenitic pyroxenes with variable chemical compositions and plagioclase. Fragment-rich impact melt rocks with sizes of several mm occur. These contain Ca-rich pyroxene and Fe-Ni metal with Ni contents of ~10 wt%. Accessories are a silica polymorph, Cr-spinel, troilite, and Fe-Ni metal. Diogenite component >90 vol%.

Geochemistry: Mineral compositions and geochemistry: Composition of diogenitic pyroxene: Fs28.3±2.3Wo2.1±0.3 (Fs23.8-31.3Wo1.5-2.5); mean Fe/Mn (at.): 32.4; n=15. Plagioclase composition: An91.9±1.5Or0.2±0.4 (An87.9-93.7Or0.0-1.3); n=14. Composition of Ca-rich pyroxene in impact melt rocks: Fs12.9±0.0Wo43.2±0.4 (Fs12.9Wo43.0-43.5); n=2.

Classification: Polymict diogenite, based on mineral chemistry, high chemical variability of diogenitic pyroxene, occurrence of admixed impact melt rocks, and high abundance (>90 vol%) of diogenitic components.

Specimens: The weight of the largest piece is 9.6 g.

Data from:
  MB113
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2023
Mass (g):218
Pieces:Many
Class:Diogenite-pm
Shock stage:moderate
Weathering grade:high
Ferrosilite (mol%):28.3±2.3
Wollastonite (mol%):2.1±0.3
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:Mohamed Ali Loud
Comments:Submitted by K. Metzler, IfP
Institutions
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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Photos:
CreditPhotos
Public domain photographs:
Knut Metzler      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9746 approved meteorites from (Northwest Africa) (plus 1855 unapproved names)

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