Meteoritical Bulletin: Entry for Northwest Africa 12879

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Northwest Africa 12879

Basic information

Name: Northwest Africa 12879
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12879
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass: 11 g

Classification
history:

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

This is 1 of 54 approved meteorites classified as Angrite. [show all]
Search for other: Achondrites, Angrites

Comments:

Approved 6 Oct 2019

Writeup

help

Writeup from MB 108:

Northwest Africa 12879 (NWA 12879)

(Northwest Africa)

Purchased: 2019

Classification: Angrite

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

Physical characteristics: Many small dark brownish fragments without fusion crust.

Petrography: The meteorite exhibits a subophitic texture of lath-shaped up to 200 µm sized anorthite, Al-Ti-augite, and Ca-rich olivine. Pyroxene and olivine show strong compositional zoning, which in case of olivine can be reverse. Several olivine grains are overgrown by kirschsteinite. Minor phases include titanomagnetite, troilite, kuratite, and silicoapatite.

Geochemistry: olivine: Fa_65.1±20.9Ln9.5±6.8 (Fa_15.6-84.9Ln0.4-21.2, FeO/MnO=86±12, n=36); clinopyroxene: Fs_33.2±12.1Wo_51.9±0.9(Fs_19.9-49.5Wo_49.9-53.1, FeO/MnO=110±26, TiO₂ = 2.2±0.9 wt%, Al₂O₃ = 7.6±1.1 wt%, n=22); kirschsteinite: Fa_60.1±1.8Ln36.1±1.4 (Fa_57.7-63.4Ln33.1-38.0, FeO/MnO=70±4, n=11); anorthite: An_99.6±0.2(An_99.1-99.8, n=11)

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2019
Mass (g):	11
Pieces:	many
Class:	Angrite
Shock stage:	low
Weathering grade:	low
Fayalite (mol%):	65.1; 60.1
Ferrosilite (mol%):	33.2
Wollastonite (mol%):	51.9
Classifier:	A. Greshake, MNB
Type spec mass (g):	2.2
Type spec location:	MNB
Main mass:	Said Yousfi
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. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150

Find references in NASA ADS:
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Photos:

Credit	Photos
Photos uploaded by members of the Encyclopedia of Meteorites. (Caution, these are of unknown reliability)
Said Yousfi

Geography:

Coordinates:

Unknown.

Statistics:
This is 1 of 9914 approved meteorites from (Northwest Africa) (plus 1841 unapproved names)

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