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Northwest Africa 13786
Basic information Name: Northwest Africa 13786
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13786
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 27.4 g
Classification
  history:
Recommended:  Martian (nakhlite)    [explanation]

This is 1 of 26 approved meteorites classified as Martian (nakhlite).   [show all]
Search for other: Martian meteorites
Comments: Approved 28 Mar 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 13786 (NWA 13786)

(Northwest Africa)

Purchased: 2021

Classification: Martian meteorite (Nakhlite)

History: The meteorite was purchased from a group of meteorites hunters in Nouadhibou, Mauritania, in early 2021.

Physical characteristics: Almost black friable rock without fusion crust. Displays a deep-greenish interior with apparent lath shaped crystals.

Petrography: The meteorite displays a cumulate texture and is predominantly composed of compositionally zoned often prismatic augite (up to 1.5 mm) with interstitial plagioclase and alkali feldspathic glass. Less abundant minerals are Fe-rich olivine, ferropigeonite, titanomagnetite, ilmenite, and chlorapatite. Olivine contains low-Ca pyroxene-titanomagnetite symplectites and "iddingsitic" material.

Geochemistry: augite: Fs25.6±4.1Wo38.8±0.4 (Fs21.2-30.1Wo38.3-40.0, FeO/MnO=32±3, n=14); ferropigeonite: Fs55.1±2.9Wo11.0±3.5 (Fs50.9-58.7Wo7.1-16.2, FeO/MnO=31±1, n=8); olivine: Fa67.1±0.9 (Fa65.8-68.0, FeO/MnO=46±2, n=12); plagioclase: An34.9±3.5Or3.7±0.5 (An30.0-38.0Or3.3-4.4, n=3); intercumulus glass: Ab59.9±7.9An10.2±4.3Or29.9±12.1, N=8

Classification: Martian (nakhlite)

Specimens: 5.5 g including a polished mount at MNB; main mass with Mr. Salamu Ali.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Nouadhibou, Mauritania
Date:P 2021
Mass (g):27.4
Pieces:1
Class:Martian (nakhlite)
Shock stage:low
Weathering grade:low
Fayalite (mol%):67.1
Ferrosilite (mol%):25.6; 55.1
Wollastonite (mol%):38.8; 11.0
Classifier:A. Greshake, MNB
Type spec mass (g):5.5
Type spec location:MNB
Main mass:Salamu Ali
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:
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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