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Northwest Africa 15458
Basic information Name: Northwest Africa 15458
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15458
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 1470 g
Classification
  history:
Recommended:  R3-4    [explanation]

This is 1 of 12 approved meteorites classified as R3-4.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Comments: Approved 25 Dec 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 15458 (NWA 15458)

(Northwest Africa)

Purchased: 2022 Oct

Classification: Rumuruti chondrite (R3-4)

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

Physical characteristics: Brownish rock without fusion crust.

Petrography: Chondritic breccia composed of up to 5 cm sized type 4 and dark up to 3 mm sized melt clasts set in type 3 matrix. Type 3 and 4 lithologies are composed of well outlined mostly rounded chondrules (apparent mean diameter about 450 μm) and mineral fragments set in abundant matrix dominated by Fe-rich olivine. Minor phases include Ca-pyroxene and sodic plagioclase. Opaques are troilite, pentlandite, and chromite; no metal has been detected.

Geochemistry: type 3 lithology: olivine: Fa26.5±16.3 (Fa1.0-44.2, n=22); low-Ca pyroxene: Fs15.8±12.6Wo0.8±0.3 (Fs2.7-30.0Wo0.3-1.1, n=10); ; type 4 lithology: olivine: Fa37.6±0.4 (Fa37.1-38.5, FeO/MnO=78±4, n=10); low-Ca pyroxene: Fs20.4±7.1Wo0.7±0.9 (Fs13.9-29.2Wo0.1-3.1, n=10); Ca-pyroxene: Fs9.3±0.4Wo45.5±1.0 (Fs8.8-10.4Wo43.0-47.0, n=10)

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2022 Oct
Mass (g):1470
Pieces:1
Class:R3-4
Shock stage:S1
Weathering grade:moderate
Fayalite (mol%):26.5; 37.6
Ferrosilite (mol%):15.8; 20.4; 9.3
Wollastonite (mol%):0.8; 0.7; 45.5
Classifier:A. Greshake, MNB
Type spec mass (g):24.1
Type spec location:MNB
Main mass:Polandmet - Marcin Cimala
Comments:Submitted by Ansgar Greshake
Institutions
   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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Woreczko Jan & Wadi      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9013 approved meteorites from (Northwest Africa) (plus 1869 unapproved names)

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