Meteoritical Bulletin: Entry for Northwest Africa 13786

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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: 27.4 g

Classification
history:

Meteoritical Bulletin:	MB 110	(2022)	Martian (nakhlite)
Recommended:			Martian (nakhlite) [explanation]

This is 1 of 32 approved meteorites classified as Martian (nakhlite). [show all]
Search for other: Martian meteorites

Comments:

Approved 28 Mar 2021

Writeup

help

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: Fs_25.6±4.1Wo_38.8±0.4(Fs_21.2-30.1Wo_38.3-40.0, FeO/MnO=32±3, n=14); ferropigeonite: Fs_55.1±2.9Wo_11.0±3.5(Fs_50.9-58.7Wo_7.1-16.2, FeO/MnO=31±1, n=8); olivine: Fa_67.1±0.9(Fa_65.8-68.0, FeO/MnO=46±2, n=12); plagioclase: An_34.9±3.5Or_3.7±0.5(An_30.0-38.0Or_3.3-4.4, n=3); intercumulus glass: Ab_59.9±7.9An_10.2±4.3Or_29.9±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 Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4

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Photos:

Credit	Photos
Public domain photographs:
Ansgar Greshake

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9710 approved meteorites from (Northwest Africa) (plus 1853 unapproved names)

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Revision
history:

This lists important revisions made to data for this record.

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