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Northwest Africa 13696
Basic information Name: Northwest Africa 13696
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13696
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 646 g
Classification
  history:
Recommended:  Winonaite    [explanation]

This is 1 of 49 approved meteorites classified as Winonaite.   [show all]
Search for other: Primitive achondrites, Winonaites
Comments: Approved 21 Feb 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13696 (NWA 13696)

(Northwest Africa)

Purchased: 2020

Classification: Primitive achondrite (Winonaite)

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

Physical characteristics: Two brownish fragments partly covered with fusion crust exposing abundant metal grains at the surface.

Petrography: The meteorite shows a recrystallized metamorphic texture with abundant 120 degree triple junctions. It is predominantly composed of 50 to 300 µm sized low-Ca pyroxene, Mg-rich olivine, diopside, and sodic feldspar grains. Low-Ca pyroxene is the most abundant mineral phase and often poikilitically encloses rounded to subrounded feldspar grains. No chondrules were observed. Kamacite, taenite, and troilite are finely dispersed throughout the meteorite. Contains minor chromite and chlorapatite. Some grain boundaries are decorated with secondary Fe-oxides.

Geochemistry: olivine: Fa4.1±0.1 (Fa4.0-4.3, FeO/MnO=17±1, n=5); low-Ca pyroxene: Fs4.8±0.1Wo1.9±0.1 (Fs4.7-4.9Wo1.8-2.0, FeO/MnO=11±1, n=5); diopside: Fs1.8±0.1Wo45.5±0.3 (Fs1.7-2.0Wo45.1-45.9, FeO/MnO=9±2, n=5); feldspar: An21.9±0.3Ab75.3±0.5Or2.9±0.2, n=5

Classification: Winonaite; likely paired with NWA 13624

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2020
Mass (g):646
Pieces:2
Class:Winonaite
Shock stage:S1
Weathering grade:low
Fayalite (mol%):4.1±0.1 (n=5)
Ferrosilite (mol%):4.8±0.1 (n=5)
Wollastonite (mol%):1.9±.1
Classifier:A. Greshake, MNB
Type spec mass (g):20.3
Type spec location:MNB
Main mass:Marcin Cimala
Finder:anonymous
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. 110, in preparation (2021)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7579 approved meteorites from (Northwest Africa) (plus 1969 unapproved names)

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