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Northwest Africa 15418
Basic information Name: Northwest Africa 15418
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15418
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 1376 g
Meteoritical Bulletin:  MB 111  (2023)  R3-6
Recommended:  R3-6    [explanation]

This is 1 of 34 approved meteorites classified as R3-6.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Comments: Approved 11 Dec 2022
Writeup from MB 111:

Northwest Africa 15418 (NWA 15418)

(Northwest Africa)

Purchased: 2022

Classification: Rumuruti chondrite (R3-6)

History: The meteorite was purchased from a meteorite dealer in Morocco.

Physical characteristics: Brownish rock without fusion crust.

Petrography: The meteorite is a breccia composed of up to 3 cm sized light brownish coloured mostly angular type 6 and few black impact melt clasts set in type 3 matrix with abundant chondrules. Type 6 clasts are dominated by Fe-rich olivine, diopside, and sodic plagioclase, type 3 clasts contain well defined mostly rounded chondrules with an average diameter of about 400 μm. Olivine and low-Ca pyroxene are compositionally unequilibrated. Opaques phases include pentlandite, troilite, and Ti-bearing chromite; no metal detected.

Geochemistry: type 3 lithology: olivine: Fa25.5±14.3 (Fa3.6-39.8, n=12); low-Ca pyroxene: Fs18.9±7.8Wo0.8±0.6 (Fs8.9-29.6Wo0.3-2.2, n=10); type 6 lithology: olivine: Fa39.0±0.5 (FeO/MnO=83±6, n=7); Ca-pyroxene: Fs8.8±0.7Wo46.3±0.3, n=7; feldspar: An10.2-14.4Ab84.0-87.9Or1.6-2.4, n=7

Classification: Rumuruti 3-6 breccia; likely paired with NWA 14862.

Data from:
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2022
Mass (g):1376
Shock stage:S1
Weathering grade:moderate
Fayalite (mol%):25.5; 39.0
Ferrosilite (mol%):18.9; 8.8
Wollastonite (mol%):0.8; 46.3
Classifier:A. Greshake, MNB
Type spec mass (g):31.1
Type spec location:MNB
Main mass:Polandmet - Marcin Cimala
Comments:Submitted by Ansgar Greshake
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Polandmet: targoniny 30 43445 Dziegielow Poland, Poland; Website (institutional address; updated 7 May 2021)
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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     This is 1 of 9729 approved meteorites from (Northwest Africa) (plus 1859 unapproved names)

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