Meteoritical Bulletin: Entry for Northwest Africa 16415

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Northwest Africa 16415

Basic information

Name: Northwest Africa 16415
This is an OFFICIAL meteorite name.
Abbreviation: NWA 16415
Observed fall: No
Year found: 2023
Country: (Northwest Africa)
Mass: 9.4 kg

Classification
history:

Recommended:

CO3 [explanation]

This is 1 of 653 approved meteorites (plus 2 unapproved names) classified as CO3. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites

Comments:

Approved 10 Jan 2024

Writeup

Writeup from MB 113:

Northwest Africa 16415 (NWA 16415)

(Northwest Africa)

Purchased: 2023 Sep

Classification: Carbonaceous chondrite (CO3)

Petrography: (K. Metzler, IfP) Chondrules, chondrule fragments, and CAIs are embedded in a fine-grained dark brown matrix (about 25 vol% matrix). The vast majority of chondrules belong to chemical type I. Chondrule sizes mostly between 50 and 300 µm.

Geochemistry: Mineral compositions and geochemistry: Olivine composition: Fa_7.3±5.2(Fa_0.4-22.5); n=16. Composition of low-Ca pyroxene: Fs_2.4±1.6Wo_1.8±1.2(Fs_0.8-5.3Wo_0.6-4.5); n=18.

Classification: CO chondrite based on CAI occurrence, small chondrule size, chondrule-matrix ratio, and mineral chemistry. Petrologic type 3 based on the chemical variation of olivine and pyroxene. Petrologic subtype (<3.5) based on the PMD of Fa values (~71).

Data from:
  MB113
  Table 0
  Line 0:

Place of purchase:	Nouadhibou, Mauritania
Date:	P 2023 Sep
Mass (g):	9400
Pieces:	Several
Class:	CO3
Shock stage:	C-S1
Weathering grade:	high
Fayalite (mol%):	7.3±5.2
Ferrosilite (mol%):	2.4±1.6
Wollastonite (mol%):	1.8±1.2
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:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Cyril Chedoz
Public domain photographs:
Knut Metzler

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9921 approved meteorites from (Northwest Africa) (plus 1838 unapproved names)

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