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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
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 f├╝r Naturkunde, Invalidenstra├če 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 Meteoritical Bulletin, no. 111, in preparation (2022)
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     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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