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Northwest Africa 15524
Basic information Name: Northwest Africa 15524
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15524
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 1312 g
Meteoritical Bulletin:  MB 112  (2023)  CR2
Recommended:  CR2    [explanation]

This is 1 of 185 approved meteorites classified as CR2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites
Comments: Approved 1 Apr 2023
Writeup from MB 112:

Northwest Africa 15524 (NWA 15524)

(Northwest Africa)

Purchased: 2022 Oct

Classification: Carbonaceous chondrite (CR2)

History: Reportedly found in 2021 in the area of In Salah, Algeria.

Petrography: (K. Metzler, IfP) Unequilibrated chondrite, consisting of metal-bearing chondrules, chondrule fragments, and few CAIs, embedded in a fine-grained brownish matrix (~40 vol% matrix). The chondrule population is dominated by porphyritic type I chondrules, some of which contain Ca-rich plagioclase. A few type II chondrules were observed. Many type I chondrules are (multi-)layered, showing igneous rims and layers of metal beads. Apparent chondrule sizes are mostly between 400 and 1000 µm; a few chondrules with sizes up to 3 mm are present. The interchondrule matrix contains clusters of magnetite (platelets and framboids), indicative of aqueous alteration processes.

Geochemistry: Mineral compositions and geochemistry: The mean olivine composition is Fa7.4±11.5 (Fa0.8-37.2; n=18); the mean low-Ca pyroxene composition is Fs3.1±1.4 Wo0.8±0.3 (Fs1.4-6.1 Wo0.3-1.3; n=15).

Classification: CR2 chondrite based on chondrule size and texture, mineral chemistry, and occurrence of magnetite clusters in the interchondrule matrix.

Data from:
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2022 Oct
Mass (g):1312
Shock stage:C-S2
Weathering grade:W2
Fayalite (mol%):7.4±11.5
Ferrosilite (mol%):3.1±1.4
Wollastonite (mol%):0.8±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
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Andreas Möller   
Antonello Petriccione   
Public domain photographs:
Knut Metzler         

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

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