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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  (2024)  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 Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Cartier C., Consolmagno G., Goodrich C., Greshake A., Gross J., Joy K. H., Miao B. and Zhang B. (2024) The Meteoritical Bulletin, no. 112. Meteoritics & Planetary Science 59, 1820–1823. ?
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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 9825 approved meteorites from (Northwest Africa) (plus 1851 unapproved names)

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