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Northwest Africa 13789
Basic information Name: Northwest Africa 13789
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13789
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 1673 g
Classification
  history:
Recommended:  Diogenite    [explanation]

This is 1 of 455 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 28 Mar 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13789 (NWA 13789)

(Northwest Africa)

Purchased: 2020

Classification: HED achondrite (Diogenite)

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

Physical characteristics: Almost completely crusted fragment showing a grayish to orange interior.

Petrography: The meteorite is a monomict breccia predominantly composed of blocky up to 6 mm sized orthopyroxene grains and more fine-grained cataclastic regions. Minor phases include chromite, troilite, and unusually abundant metallic iron. No plagioclase has been found in the two sections studied. The meteorite is highly shocked and contains abundant shock melt veins and pockets.

Geochemistry: low-Ca pyroxene: Fs26.8±0.7Wo2.2±0.1 (Fs26.2-27.0Wo2.1-2.3, n=7, FeO/MnO=24-28; oxygen isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave: δ18O=3.306, 3.778, 3.046; δ17O=1.488, 1.713, 1.341; Δ17O= -0.257, -0.282, -0.267 (all per mil)

Classification: Diogenite

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020
Mass (g):1673
Pieces:1
Class:Diogenite
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):26.8
Wollastonite (mol%):2.2
Classifier:A. Greshake, MNB
Type spec mass (g):55.4
Type spec location:MNB
Main mass:Tomasz Jakubowski
Comments:Submitted by Ansgar Greshake
Plots: O isotopes:  
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Photos:
CreditPhotos
Public domain photographs:
Ansgar Greshake         
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7655 approved meteorites from (Northwest Africa) (plus 1972 unapproved names)

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