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Northwest Africa 13679
Basic information Name: Northwest Africa 13679
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13679
Observed fall: No
Year found: 2020
Country: (Northwest Africa)
Mass:help 1240 g
Classification
  history:
Recommended:  Winonaite    [explanation]

This is 1 of 54 approved meteorites classified as Winonaite.   [show all]
Search for other: Primitive achondrites, Winonaites
Comments: Approved 6 Feb 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13679 (NWA 13679)

(Northwest Africa)

Purchased: 2020

Classification: Primitive achondrite (Winonaite)

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

Physical characteristics: Brownish sandblasted fragment with some black fusion crust preserved. Large metal areas are exposed.

Petrography: The meteorite is composed of silicate-dominated regions crosscut by up to 8 mm wide anastomosing FeNi metal veins or pockets of metal at intersecting veins. Silicate regions show a recrystallized texture of 50 to 200 µm sized enstatite, forsteritic olivine, diopside, and sodic feldspar grains often joining at 120 degree grain boundaries. These regions contain 50 to 150 µm sized finely dispersed FeNi metal and troilite grains. Etched FeNi metal veins show Widmanstätten pattern with up to 2 mm wide kamacite bands. Rare schreibersite inclusions are present in the metal. Accessories include daubreelite and alabandite associated with troilite as well as chromite. Some secondary Fe-oxides ocurr on silicate grain boundaries and metal vein margins.

Geochemistry: olivine: Fa1.3±0.3 (Fa0.9-1.7, FeO/MnO=4±1, n=5); low-Ca pyroxene: Fs7.2±0.2Wo1.9±0.2 (Fs6.8-7.4Wo1.5-2.1, FeO/MnO=10±1, n=5); diopside: Fs3.1±0.3Wo45.3±1.0 (Fs2.7-3.7Wo45.2-46.5, FeO/MnO=7±1, n=5); feldspar: An13.1±0.3Ab83.4±0.3Or3.6±0.1, n=6

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2020
Mass (g):1240
Pieces:1
Class:Winonaite
Shock stage:S1
Weathering grade:low
Fayalite (mol%):1.3
Ferrosilite (mol%):7.2; 3.1
Wollastonite (mol%):1.9; 45.3
Classifier:A. Greshake, MNB
Type spec mass (g):28.2
Type spec location:MNB
Main mass: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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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)
Stelvino   
Geography: 
Coordinates:Unknown.

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

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