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Northwest Africa 13468
Basic information Name: Northwest Africa 13468
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13468
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 280 g
Classification
  history:
Recommended:  R3-6    [explanation]

This is 1 of 27 approved meteorites classified as R3-6.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Comments: Approved 11 Nov 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13468 (NWA 13468)

(Northwest Africa)

Purchased: July 2020

Classification: Rumuruti chondrite (R3-6)

History: The meteorite was bought by the main mass holder from an Algerian meteorite dealer.

Physical characteristics: Dark-brownish individuals without fusion crust.

Petrography: The meteorite displays a dark-brownish interior and is composed of up to 1 cm sized darker colored type 3 clasts set into type 6 matrix; some black impact melt fragments are present. Equilibrated Fe-rich olivine dominates the matrix. Olivine and low-Ca pyroxene are compositionally unequilibrated in type 3 clasts. Chondrules have an average diameter of about 400 µm. More minor phases include low-Ca pyroxene, Ca-pyroxene, sodic plagioclase, sulfides, and Ti-bearing chromite; no metal has been detected. The meteorite contains some shock veins.

Geochemistry: type 6 lithology: olivine: Fa37.9±0.3 (FeO/MnO=76±4, n=14); low-Ca pyroxene: Fs28.8±0.2Wo1.2±0.3 (FeO/MnO=49±4, n=12); Ca-pyroxene: Fs11.9±0.9Wo44.6±1.8 (FeO/MnO=44±6, n=10); type 3 lithology: olivine: Fa32.8±11.6 (Fa8.6-45.2, FeO/MnO=72±14, n=15); low-Ca pyroxene: Fs22.4±7.4Wo1.1±0.7 (Fs10.8-31.6Wo0.5-3.2, FeO/MnO=54±10, n=16)

Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Adra, Algeria
Date:P July 2020
Mass (g):280
Pieces:several
Class:R3-6
Shock stage:S2
Weathering grade:moderate
Fayalite (mol%):37.9; 32.8
Ferrosilite (mol%):28.8; 11.9; 22.4
Wollastonite (mol%):1.2; 44.6; 1.1
Classifier:A. Greshake, MNB
Type spec mass (g):20.8
Type spec location:MNB
Main mass:Lucian Cojocaru
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
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Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Stefano Prosperi   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8025 approved meteorites from (Northwest Africa) (plus 1951 unapproved names)

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