Meteoritical Bulletin: Entry for Northwest Africa 12918

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Northwest Africa 12918

Basic information

Name: Northwest Africa 12918
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12918
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass: 2.41 kg

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	Diogenite
Recommended:			Diogenite [explanation]

This is 1 of 511 approved meteorites classified as Diogenite. [show all]
Search for other: Achondrites, Diogenites, and HED achondrites

Comments:

Approved 20 Oct 2019

Writeup

Writeup from MB 108:

Northwest Africa 12918 (NWA 12918)

(Northwest Africa)

Purchased: 19 mar 2019

Classification: HED achondrite (Diogenite)

History: Purchased by Carlos Muñecas and Adrian Contreras on 19 Mar 2019 from a dealer in Guelmin, Morocco.

Physical characteristics: Partially covered by a black fusion crust.

Petrography: The specimen shows a cataclastic texture with large crystal fragments in a matrix of finer grains of the same minerals. Predominantly orthopyroxene accompanied by accessory olivine, clinopyroxene, anorthite, chromite, Ni-poor metal and troilite.

Geochemistry: Mineral compositions and geochemistry: Orthopyroxene Fs_24.6-25.7Wo_3.1-4.0, FeO/MnO=28-34; clinopyroxene Fs_10.2-11.1Wo_42.9-43.8, FeO/MnO=20-22; olivine Fa_25.8-27.6, FeO/MnO=49-50; plagioclase An_77.7-90.9.

Classification: Diogenite

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Guelmin, Morocco
Date:	P 19 mar 2019
Mass (g):	2412
Pieces:	5
Class:	Diogenite
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	26.3±0.5
Classifier:	J. Llorca, UPC
Type spec mass (g):	20.1
Type spec location:	UPC
Main mass:	Carlos Muñecas
Comments:	Submitted by Carlos Muñecas

Institutions
and collections

UPC: Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya Diagonal 647, ed. ETSEIB, 08028 Barcelona, Spain, Spain (institutional address; updated 3 May 2015)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

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Photos:

Credit	Photos
Public domain photographs:
Carlos Muñecas

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9116 approved meteorites from (Northwest Africa) (plus 1873 unapproved names)

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