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Northwest Africa 16397
Basic information Name: Northwest Africa 16397
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16397
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 550 g
Classification
  history:
Recommended:  Acapulcoite    [explanation]

This is 1 of 93 approved meteorites classified as Acapulcoite.   [show all]
Search for other: Acapulcoite-lodranite family, Acapulcoites, and Primitive achondrites
Comments: Approved 20 Feb 2024
Writeuphelp
Writeup from MB 113:

Northwest Africa 16397 (NWA 16397)

(Northwest Africa)

Purchased: 2022 Oct

Classification: Primitive achondrite (Acapulcoite)

History: Reportedly this stone was found in Western Sahara

Petrography: (K. Metzler, IfP) Recrystallized rock with abundant 120° triple junctions, consisting of olivine, low-Ca pyroxene, Ca-rich pyroxene, plagioclase, and Fe-Ni metal. Accessory phases are troilite, Cr-spinel and merrillite. Silicate grain sizes are mostly between 100 and 200 µm.

Geochemistry: Mineral compositions and geochemistry: Mean olivine composition: Fa8.3±0.2 (Fa7.9-8.5); Fe/Mn (at.): 15.5; n=10. Mean low-Ca pyroxene composition: Fs8.4±0.2 Wo1.8±0.6 (Fs8.0-8.8 Wo0.8-2.6); Fe/Mn (at.): 10.7; n=11. Mean composition of Ca-rich pyroxene: Fs3.5±0.3 Wo44.0±0.7 (Fs3.1-4.3 Wo42.0-44.6); Fe/Mn (at.): 11.2; n=11. Mean feldspar composition: An14.2±1.2 Or2.4±0.4 (An12.4-15.8 Or1.7-3.0); n=11.

Classification: Acapulcoite, based on mineralogy, mineral chemistry and mean grain size of silicates.

Data from:
  MB113
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2022 Oct
Mass (g):550
Pieces:1
Class:Acapulcoite
Shock stage:M-S1
Weathering grade:Low
Fayalite (mol%):8.3±0.2
Ferrosilite (mol%):8.4±0.2; 3.5±0.3
Wollastonite (mol%):1.8±0.6; 44.0±0.7
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:Said Muftah Bachir, Western Sahara
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)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Knut Metzler      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9729 approved meteorites from (Northwest Africa) (plus 1859 unapproved names)

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