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Northwest Africa 15523
Basic information Name: Northwest Africa 15523
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15523
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 780 g
Classification
  history:
Recommended:  CM2    [explanation]

This is 1 of 621 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Approved 4 Mar 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15523 (NWA 15523)

(Northwest Africa)

Purchased: 2022 May

Classification: Carbonaceous chondrite (CM2)

History: Reportedly found in early 2022 in Hassi Khebi, Algeria.

Petrography: (K. Metzler, IfP) Chondrules, chondrule fragments, CAIs, and PCP(TCI) particles are embedded in a fine-grained black matrix (about 50 vol% matrix). The vast majority of chondrules belong to the chemical type I. Chondrule sizes are mostly between 50 and 300 µm; a few chondrules with sizes up to 1.5 mm are present. Many chondrules are mantled by fine-grained dust. Accessories are troilite, pentlandite, and calcite.

Geochemistry: Mineral compositions and geochemistry: Mean olivine composition: Fa7.2±12.1 (Fa0.3-40.7); n=13. Mean composition of low-Ca pyroxene: Fs1.4±0.7 Wo2.4±1.8 (Fs0.7-2.7 Wo0.9-5.7; n=10)

Classification: CM2 chondrite based on the occurrence of CAIs and PCP (TCI) particles, small chondrule size, chondrule-matrix ratio, and mineral chemistry.

Data from:
  MB112
  Table 0
  Line 0:
Place of purchase:Nouadhibou, Mauritania
Date:P 2022 May
Mass (g):780
Pieces:Many
Class:CM2
Shock stage:C-S2
Weathering grade:Moderate
Fayalite (mol%):7.2±12.1
Ferrosilite (mol%):1.4±0.7
Wollastonite (mol%):2.4±1.8
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. 112, in preparation (2023)
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Photos:
CreditPhotos
Public domain photographs:
Knut Metzler      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9042 approved meteorites from (Northwest Africa) (plus 1870 unapproved names)

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